* [PATCH] usbip: vhci_hcd: move sysfs attribute setup into probe/remove
@ 2026-08-15 14:32 Deepanshu Kartikey
2026-08-15 14:47 ` [syzbot] [usb?] KASAN: slab-use-after-free Read in attach_store syzbot
0 siblings, 1 reply; 4+ messages in thread
From: Deepanshu Kartikey @ 2026-08-15 14:32 UTC (permalink / raw)
To: valentina.manea.m, shuah, i, gregkh
Cc: linux-usb, linux-kernel, Deepanshu Kartikey,
syzbot+8753715f05759f1a10de
#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
The vhci sysfs attribute group is created in vhci_start() and removed in
vhci_stop(), guarded by usb_hcd_is_primary_hcd(). Since vhci_start() and
vhci_stop() run from usb_add_hcd()/usb_remove_hcd(), which are each called
twice, the attach attribute is live while only one of the two hcds exists:
it is created during the first usb_add_hcd() before vhci_hcd_ss is set,
and it survives the first usb_put_hcd() during removal. A concurrent write
to attach can therefore reach a NULL or freed vhci_hcd_ss.
Create the group at the end of vhci_hcd_probe(), after both hcds are
added, and remove it at the start of vhci_hcd_remove(), before either
reference is dropped. sysfs_remove_group() drains in-flight store
callbacks, so no writer can be inside attach_store() once it returns.
Reported-by: syzbot+8753715f05759f1a10de@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=8753715f05759f1a10de
Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com>
---
drivers/usb/usbip/vhci_hcd.c | 66 ++++++++++++++++++++----------------
1 file changed, 36 insertions(+), 30 deletions(-)
diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c
index 39e8faf4c18c..90f166f3ae96 100644
--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -1199,7 +1199,6 @@ static int vhci_start(struct usb_hcd *hcd)
{
struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
int id, rhport;
- int err;
usbip_dbg_vhci_hc("enter vhci_start\n");
@@ -1230,40 +1229,17 @@ static int vhci_start(struct usb_hcd *hcd)
return -EINVAL;
}
- /* vhci_hcd is now ready to be controlled through sysfs */
- if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
- err = vhci_init_attr_group();
- if (err) {
- dev_err(hcd_dev(hcd), "init attr group failed, err = %d\n", err);
- return err;
- }
- err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
- if (err) {
- dev_err(hcd_dev(hcd), "create sysfs files failed, err = %d\n", err);
- vhci_finish_attr_group();
- return err;
- }
- dev_info(hcd_dev(hcd), "created sysfs %s\n", hcd_name(hcd));
- }
-
return 0;
}
static void vhci_stop(struct usb_hcd *hcd)
{
struct vhci_hcd *vhci_hcd = hcd_to_vhci_hcd(hcd);
- int id, rhport;
+ int rhport;
usbip_dbg_vhci_hc("stop VHCI controller\n");
- /* 1. remove the userland interface of vhci_hcd */
- id = hcd_name_to_id(hcd_name(hcd));
- if (id == 0 && usb_hcd_is_primary_hcd(hcd)) {
- sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
- vhci_finish_attr_group();
- }
-
- /* 2. shutdown all the ports of vhci_hcd */
+ /* shutdown all the ports of vhci_hcd */
for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
@@ -1405,8 +1381,25 @@ static int vhci_hcd_probe(struct platform_device *pdev)
}
usbip_dbg_vhci_hc("bye\n");
+
+ if (pdev->id == 0) {
+ ret = vhci_init_attr_group();
+ if (ret) {
+ dev_err_probe(&pdev->dev, ret, "init attr group failed\n");
+ goto remove_usb3_hcd;
+ }
+ ret = sysfs_create_group(&pdev->dev.kobj, &vhci_attr_group);
+ if (ret) {
+ dev_err_probe(&pdev->dev, ret, "create sysfs files failed\n");
+ vhci_finish_attr_group();
+ goto remove_usb3_hcd;
+ }
+ }
+
return 0;
+remove_usb3_hcd:
+ usb_remove_hcd(hcd_ss);
put_usb3_hcd:
usb_put_hcd(hcd_ss);
remove_usb2_hcd:
@@ -1421,17 +1414,30 @@ static int vhci_hcd_probe(struct platform_device *pdev)
static void vhci_hcd_remove(struct platform_device *pdev)
{
struct vhci *vhci = *((void **)dev_get_platdata(&pdev->dev));
+ struct usb_hcd *hcd_hs = vhci_hcd_to_hcd(vhci->vhci_hcd_hs);
+ struct usb_hcd *hcd_ss = vhci_hcd_to_hcd(vhci->vhci_hcd_ss);
+
+ /*
+ * Remove the userland interface before dropping the hcd references.
+ * sysfs_remove_group() waits for in-flight attach_store()/detach_store()
+ * callers to return and rejects new ones, so neither hcd can be reached
+ * from sysfs by the time it is freed below.
+ */
+ if (pdev->id == 0) {
+ sysfs_remove_group(&pdev->dev.kobj, &vhci_attr_group);
+ vhci_finish_attr_group();
+ }
/*
* Disconnects the root hub,
* then reverses the effects of usb_add_hcd(),
* invoking the HCD's stop() methods.
*/
- usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
- usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_ss));
+ usb_remove_hcd(hcd_ss);
+ usb_put_hcd(hcd_ss);
- usb_remove_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
- usb_put_hcd(vhci_hcd_to_hcd(vhci->vhci_hcd_hs));
+ usb_remove_hcd(hcd_hs);
+ usb_put_hcd(hcd_hs);
vhci->vhci_hcd_hs = NULL;
vhci->vhci_hcd_ss = NULL;
--
2.43.0
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [syzbot] [usb?] KASAN: slab-use-after-free Read in attach_store
2026-08-15 14:32 [PATCH] usbip: vhci_hcd: move sysfs attribute setup into probe/remove Deepanshu Kartikey
@ 2026-08-15 14:47 ` syzbot
0 siblings, 0 replies; 4+ messages in thread
From: syzbot @ 2026-08-15 14:47 UTC (permalink / raw)
To: gregkh, i, kartikey406, linux-kernel, linux-usb, shuah,
syzkaller-bugs, valentina.manea.m
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+8753715f05759f1a10de@syzkaller.appspotmail.com
Tested-by: syzbot+8753715f05759f1a10de@syzkaller.appspotmail.com
Tested on:
commit: 15ef2f78 Merge tag 'input-for-v7.2-rc7' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16bb3279580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307
dashboard link: https://syzkaller.appspot.com/bug?extid=8753715f05759f1a10de
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch: https://syzkaller.appspot.com/x/patch.diff?x=15dc6949580000
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 4+ messages in thread
[parent not found: <20260815124745.17106-1-kartikey406@gmail.com>]
* Re: [syzbot] [usb?] KASAN: slab-use-after-free Read in attach_store
[not found] <20260815124745.17106-1-kartikey406@gmail.com>
@ 2026-08-15 13:06 ` syzbot
0 siblings, 0 replies; 4+ messages in thread
From: syzbot @ 2026-08-15 13:06 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in attach_store
Oops: general protection fault, probably for non-canonical address 0xdffffc000000001f: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000000f8-0x00000000000000ff]
CPU: 3 UID: 0 PID: 5994 Comm: syz-executor227 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x15d/0x1bd0 kernel/locking/mutex.c:821
Code: 08 84 d2 0f 85 67 14 00 00 44 8b 3d bd 29 b6 0f 45 85 ff 75 29 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5e 14 00 00 48 3b 5b 58 0f 85 8b 07 00 00 bf 01
RSP: 0018:ffffc900034a79c0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 00000000000000a0 RCX: 0000000000000001
RDX: 000000000000001f RSI: ffffffff8e183b4b RDI: 00000000000000f8
RBP: ffffc900034a7b30 R08: ffffffff87ea8263 R09: 0000000000000004
R10: ffffc900034a7b48 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS: 00007fa40066f6c0(0000) GS:ffff8880d60e9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555b3ccb5258 CR3: 000000002e664000 CR4: 0000000000352ef0
Call Trace:
<TASK>
attach_store+0x333/0x8f0 drivers/usb/usbip/vhci_sysfs.c:364
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa401ec7bde
Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08
RSP: 002b:00007fa40066f098 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa40066f6c0 RCX: 00007fa401ec7bde
RDX: 0000000000000009 RSI: 00007fa40066f100 RDI: 0000000000000007
RBP: 00007fa401f130b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffd0
R13: 0000000000000009 R14: 00007ffc9812f530 R15: 00007ffc9812f618
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x15d/0x1bd0 kernel/locking/mutex.c:821
Code: 08 84 d2 0f 85 67 14 00 00 44 8b 3d bd 29 b6 0f 45 85 ff 75 29 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5e 14 00 00 48 3b 5b 58 0f 85 8b 07 00 00 bf 01
RSP: 0018:ffffc900034a79c0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 00000000000000a0 RCX: 0000000000000001
RDX: 000000000000001f RSI: ffffffff8e183b4b RDI: 00000000000000f8
RBP: ffffc900034a7b30 R08: ffffffff87ea8263 R09: 0000000000000004
R10: ffffc900034a7b48 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS: 00007fa40066f6c0(0000) GS:ffff8880d60e9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555b3cb6c620 CR3: 000000002e664000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 08 84 d2 0f 85 67 14 or %al,0x1467850f(%rdx,%rdx,8)
7: 00 00 add %al,(%rax)
9: 44 8b 3d bd 29 b6 0f mov 0xfb629bd(%rip),%r15d # 0xfb629cd
10: 45 85 ff test %r15d,%r15d
13: 75 29 jne 0x3e
15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1c: fc ff df
1f: 48 8d 7b 58 lea 0x58(%rbx),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 5e 14 00 00 jne 0x1492
34: 48 3b 5b 58 cmp 0x58(%rbx),%rbx
38: 0f 85 8b 07 00 00 jne 0x7c9
3e: bf .byte 0xbf
3f: 01 .byte 0x1
Tested on:
commit: 15ef2f78 Merge tag 'input-for-v7.2-rc7' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=158bca25580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307
dashboard link: https://syzkaller.appspot.com/bug?extid=8753715f05759f1a10de
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch: https://syzkaller.appspot.com/x/patch.diff?x=17f74279580000
^ permalink raw reply [flat|nested] 4+ messages in thread
* [syzbot] [usb?] KASAN: slab-use-after-free Read in attach_store
@ 2026-08-14 9:32 syzbot
0 siblings, 0 replies; 4+ messages in thread
From: syzbot @ 2026-08-14 9:32 UTC (permalink / raw)
To: linux-kernel, linux-usb, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 2f1baf1fc892 Merge tag 'trace-v7.2-rc7' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13a98a25580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307
dashboard link: https://syzkaller.appspot.com/bug?extid=8753715f05759f1a10de
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12de5279580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8753715f05759f1a10de@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:728 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock+0x18bb/0x1bd0 kernel/locking/mutex.c:821
Read of size 8 at addr ffff8880265c84f0 by task syz-executor396/6022
CPU: 0 UID: 0 PID: 6022 Comm: syz-executor396 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x13d/0x4b0 mm/kasan/report.c:482
kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
__mutex_lock_common kernel/locking/mutex.c:728 [inline]
__mutex_lock+0x18bb/0x1bd0 kernel/locking/mutex.c:821
attach_store+0x333/0x8f0 drivers/usb/usbip/vhci_sysfs.c:364
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f9e9f6bde
Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08
RSP: 002b:00007f5f9e1a0098 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5f9e1a06c0 RCX: 00007f5f9e9f6bde
RDX: 0000000000000009 RSI: 00007f5f9e1a0100 RDI: 0000000000000008
RBP: 00007f5f9ea420b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffd0
R13: 0000000000000009 R14: 00007ffc89c49e90 R15: 00007ffc89c49f78
</TASK>
Allocated by task 1:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5334 [inline]
__kmalloc_noprof+0x322/0x820 mm/slub.c:5359
_kmalloc_noprof include/linux/slab.h:992 [inline]
_kzalloc_noprof include/linux/slab.h:1309 [inline]
__usb_create_hcd+0x5e/0xac0 drivers/usb/core/hcd.c:2566
vhci_hcd_probe+0x1a5/0x4e0 drivers/usb/usbip/vhci_hcd.c:1394
platform_probe+0x106/0x1d0 drivers/base/platform.c:1439
call_driver_probe drivers/base/dd.c:628 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:706
__driver_probe_device+0x20e/0x450 drivers/base/dd.c:868
driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
__device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153
bus_probe_device+0x64/0x160 drivers/base/bus.c:620
device_add+0x121d/0x1970 drivers/base/core.c:3772
platform_device_add+0x35a/0x800 drivers/base/platform.c:762
platform_device_register_full+0x5cf/0x830 drivers/base/platform.c:902
vhci_hcd_init+0x1a1/0x2f0 drivers/usb/usbip/vhci_hcd.c:1557
do_one_initcall+0x11d/0x700 init/main.c:1347
do_initcall_level init/main.c:1409 [inline]
do_initcalls init/main.c:1425 [inline]
do_basic_setup init/main.c:1445 [inline]
kernel_init_freeable+0x6ea/0x7b0 init/main.c:1658
kernel_init+0x1f/0x1e0 init/main.c:1548
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 6021:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2677 [inline]
slab_free mm/slub.c:6377 [inline]
kfree+0x22b/0x6c0 mm/slub.c:6692
hcd_release drivers/usb/core/hcd.c:2690 [inline]
kref_put include/linux/kref.h:65 [inline]
usb_put_hcd drivers/usb/core/hcd.c:2704 [inline]
usb_put_hcd+0x149/0x1f0 drivers/usb/core/hcd.c:2701
vhci_hcd_remove+0xb5/0x1b0 drivers/usb/usbip/vhci_hcd.c:1431
platform_remove+0x5f/0x80 drivers/base/platform.c:1456
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
unbind_store+0xf8/0x110 drivers/base/bus.c:244
drv_attr_store+0x74/0xb0 drivers/base/bus.c:125
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Last potentially related work creation:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
insert_work+0x36/0x230 kernel/workqueue.c:2226
__queue_work+0x9bc/0x12b0 kernel/workqueue.c:2401
queue_work_on+0x1a9/0x1e0 kernel/workqueue.c:2452
queue_work include/linux/workqueue.h:699 [inline]
usb_hcd_giveback_urb+0x330/0x4a0 drivers/usb/core/hcd.c:1758
usb_rh_urb_dequeue drivers/usb/core/hcd.c:845 [inline]
unlink1+0x418/0x510 drivers/usb/core/hcd.c:1580
usb_hcd_unlink_urb+0x131/0x210 drivers/usb/core/hcd.c:1617
usb_kill_urb drivers/usb/core/urb.c:716 [inline]
usb_kill_urb+0x121/0x320 drivers/usb/core/urb.c:703
hub_quiesce+0x1e9/0x320 drivers/usb/core/hub.c:1412
hub_suspend+0x4ab/0x9e0 drivers/usb/core/hub.c:4016
usb_suspend_interface drivers/usb/core/driver.c:1323 [inline]
usb_suspend_both+0x288/0x950 drivers/usb/core/driver.c:1446
usb_runtime_suspend+0x49/0x120 drivers/usb/core/driver.c:2000
__rpm_callback+0xc8/0x620 drivers/base/power/runtime.c:406
rpm_callback+0x16a/0x1b0 drivers/base/power/runtime.c:460
rpm_suspend+0x2f4/0x11a0 drivers/base/power/runtime.c:698
__pm_runtime_suspend+0xba/0x1a0 drivers/base/power/runtime.c:1167
pm_runtime_put_sync_autosuspend include/linux/pm_runtime.h:740 [inline]
usb_new_device.part.0+0x1653/0x1686 drivers/usb/core/hub.c:2735
register_root_hub+0x4e6/0x639 drivers/usb/core/hcd.c:990
usb_add_hcd.cold+0xccd/0x1158 drivers/usb/core/hcd.c:2987
vhci_hcd_probe+0x1c2/0x4e0 drivers/usb/usbip/vhci_hcd.c:1401
platform_probe+0x106/0x1d0 drivers/base/platform.c:1439
call_driver_probe drivers/base/dd.c:628 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:706
__driver_probe_device+0x20e/0x450 drivers/base/dd.c:868
driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
__device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153
bus_probe_device+0x64/0x160 drivers/base/bus.c:620
device_add+0x121d/0x1970 drivers/base/core.c:3772
platform_device_add+0x35a/0x800 drivers/base/platform.c:762
platform_device_register_full+0x5cf/0x830 drivers/base/platform.c:902
vhci_hcd_init+0x1a1/0x2f0 drivers/usb/usbip/vhci_hcd.c:1557
do_one_initcall+0x11d/0x700 init/main.c:1347
do_initcall_level init/main.c:1409 [inline]
do_initcalls init/main.c:1425 [inline]
do_basic_setup init/main.c:1445 [inline]
kernel_init_freeable+0x6ea/0x7b0 init/main.c:1658
kernel_init+0x1f/0x1e0 init/main.c:1548
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Second to last potentially related work creation:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
insert_work+0x36/0x230 kernel/workqueue.c:2226
__queue_work+0x9bc/0x12b0 kernel/workqueue.c:2401
queue_work_on+0x1a9/0x1e0 kernel/workqueue.c:2452
queue_work include/linux/workqueue.h:699 [inline]
usb_hcd_giveback_urb+0x3b8/0x4a0 drivers/usb/core/hcd.c:1760
rh_call_control drivers/usb/core/hcd.c:706 [inline]
rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline]
usb_hcd_submit_urb+0xab7/0x2150 drivers/usb/core/hcd.c:1538
usb_submit_urb+0x827/0x19b0 drivers/usb/core/urb.c:586
usb_start_wait_urb+0x10e/0x580 drivers/usb/core/message.c:62
usb_internal_control_msg drivers/usb/core/message.c:117 [inline]
usb_control_msg+0x328/0x4b0 drivers/usb/core/message.c:167
set_port_feature drivers/usb/core/hub.c:466 [inline]
hub_suspend+0x826/0x9e0 drivers/usb/core/hub.c:4004
usb_suspend_interface drivers/usb/core/driver.c:1323 [inline]
usb_suspend_both+0x288/0x950 drivers/usb/core/driver.c:1446
usb_runtime_suspend+0x49/0x120 drivers/usb/core/driver.c:2000
__rpm_callback+0xc8/0x620 drivers/base/power/runtime.c:406
rpm_callback+0x16a/0x1b0 drivers/base/power/runtime.c:460
rpm_suspend+0x2f4/0x11a0 drivers/base/power/runtime.c:698
__pm_runtime_suspend+0xba/0x1a0 drivers/base/power/runtime.c:1167
pm_runtime_put_sync_autosuspend include/linux/pm_runtime.h:740 [inline]
usb_new_device.part.0+0x1653/0x1686 drivers/usb/core/hub.c:2735
register_root_hub+0x4e6/0x639 drivers/usb/core/hcd.c:990
usb_add_hcd.cold+0xccd/0x1158 drivers/usb/core/hcd.c:2987
vhci_hcd_probe+0x1c2/0x4e0 drivers/usb/usbip/vhci_hcd.c:1401
platform_probe+0x106/0x1d0 drivers/base/platform.c:1439
call_driver_probe drivers/base/dd.c:628 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:706
__driver_probe_device+0x20e/0x450 drivers/base/dd.c:868
driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
__device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153
bus_probe_device+0x64/0x160 drivers/base/bus.c:620
device_add+0x121d/0x1970 drivers/base/core.c:3772
platform_device_add+0x35a/0x800 drivers/base/platform.c:762
platform_device_register_full+0x5cf/0x830 drivers/base/platform.c:902
vhci_hcd_init+0x1a1/0x2f0 drivers/usb/usbip/vhci_hcd.c:1557
do_one_initcall+0x11d/0x700 init/main.c:1347
do_initcall_level init/main.c:1409 [inline]
do_initcalls init/main.c:1425 [inline]
do_basic_setup init/main.c:1445 [inline]
kernel_init_freeable+0x6ea/0x7b0 init/main.c:1658
kernel_init+0x1f/0x1e0 init/main.c:1548
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff8880265c8000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 1264 bytes inside of
freed 8192-byte region [ffff8880265c8000, ffff8880265ca000)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x265c8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801bc43180 dead000000000122 0000000000000000
raw: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801bc43180 dead000000000122 0000000000000000
head: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000
head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 11610115084, free_ts 6038226833
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
prep_new_page mm/page_alloc.c:1867 [inline]
get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3266 [inline]
allocate_slab mm/slub.c:3380 [inline]
new_slab+0xa2/0x640 mm/slub.c:3426
refill_objects+0xe3/0x410 mm/slub.c:7310
refill_sheaf mm/slub.c:2804 [inline]
__pcs_replace_empty_main+0x376/0x680 mm/slub.c:4675
alloc_from_pcs mm/slub.c:4773 [inline]
slab_alloc_node mm/slub.c:4905 [inline]
__do_kmalloc_node mm/slub.c:5333 [inline]
__kmalloc_noprof+0x66d/0x820 mm/slub.c:5359
_kmalloc_noprof include/linux/slab.h:992 [inline]
_kzalloc_noprof include/linux/slab.h:1309 [inline]
__usb_create_hcd+0x5e/0xac0 drivers/usb/core/hcd.c:2566
vhci_hcd_probe+0xf3/0x4e0 drivers/usb/usbip/vhci_hcd.c:1378
platform_probe+0x106/0x1d0 drivers/base/platform.c:1439
call_driver_probe drivers/base/dd.c:628 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:706
__driver_probe_device+0x20e/0x450 drivers/base/dd.c:868
driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
__device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098
page last free pid 34 tgid 34 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
free_pages_prepare+0x586/0xd80 mm/page_alloc.c:1451
__free_contig_range_common+0x14f/0x250 mm/page_alloc.c:6897
__free_contig_range mm/page_alloc.c:6942 [inline]
free_pages_bulk+0x12a/0x200 mm/page_alloc.c:5257
vm_area_free_pages+0xad/0x2b0 mm/vmalloc.c:3461
vfree mm/vmalloc.c:3510 [inline]
vfree+0x107/0x750 mm/vmalloc.c:3484
delayed_vfree_work+0x56/0x80 mm/vmalloc.c:3414
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff8880265c8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880265c8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880265c8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880265c8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880265c8580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2026-08-15 14:47 UTC | newest]
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[not found] <20260815140401.18791-1-kartikey406@gmail.com>
2026-08-15 14:31 ` [syzbot] [usb?] KASAN: slab-use-after-free Read in attach_store syzbot
2026-08-15 14:32 [PATCH] usbip: vhci_hcd: move sysfs attribute setup into probe/remove Deepanshu Kartikey
2026-08-15 14:47 ` [syzbot] [usb?] KASAN: slab-use-after-free Read in attach_store syzbot
[not found] <20260815124745.17106-1-kartikey406@gmail.com>
2026-08-15 13:06 ` syzbot
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2026-08-14 9:32 syzbot
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