* [syzbot] [usb?] memory leak in try_get_usb_function_instance
@ 2026-07-30 12:26 syzbot
2026-07-30 12:42 ` Forwarded: syzbot
2026-07-30 12:59 ` Forwarded: syzbot
0 siblings, 2 replies; 5+ messages in thread
From: syzbot @ 2026-07-30 12:26 UTC (permalink / raw)
To: gregkh, linux-kernel, linux-usb, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 3dab139d4795 Merge tag 'rust-fixes-7.2-2' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=163a388e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=ba7c2d1679fb08a2
dashboard link: https://syzkaller.appspot.com/bug?extid=eaa106d192c9daf37f95
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111c11b9580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12b5909e580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8c49d395f8d0/disk-3dab139d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/deff2ace5e6a/vmlinux-3dab139d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2c90a783f940/bzImage-3dab139d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+eaa106d192c9daf37f95@syzkaller.appspotmail.com
2026/07/26 12:12:48 executed programs: 5
BUG: memory leak
unreferenced object 0xffff888112a69c00 (size 512):
comm "syz.0.19", pid 5954, jiffies 4294946869
hex dump (first 32 bytes):
08 9c a6 12 81 88 ff ff 65 70 2e 30 00 00 00 00 ........ep.0....
00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 ................
backtrace (crc 56e62c00):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4597 [inline]
slab_alloc_node mm/slub.c:4917 [inline]
__kmalloc_cache_noprof+0x356/0x440 mm/slub.c:5485
_kmalloc_noprof include/linux/slab.h:988 [inline]
_kzalloc_noprof include/linux/slab.h:1309 [inline]
f_midi2_ep_opts_create drivers/usb/gadget/function/f_midi2.c:2504 [inline]
f_midi2_alloc_inst+0xa0/0x250 drivers/usb/gadget/function/f_midi2.c:2666
try_get_usb_function_instance+0xb8/0x100 drivers/usb/gadget/functions.c:28
usb_get_function_instance+0x16/0x70 drivers/usb/gadget/functions.c:44
function_make+0xf5/0x240 drivers/usb/gadget/configfs.c:626
configfs_mkdir+0x2e9/0x6f0 fs/configfs/dir.c:1360
vfs_mkdir+0x16c/0x3a0 fs/namei.c:5276
filename_mkdirat+0x27c/0x300 fs/namei.c:5309
__do_sys_mkdirat fs/namei.c:5330 [inline]
__se_sys_mkdirat fs/namei.c:5327 [inline]
__x64_sys_mkdirat+0x39/0x60 fs/namei.c:5327
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf8/0x610 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
BUG: memory leak
unreferenced object 0xffff8881105a3f00 (size 256):
comm "syz.0.19", pid 5954, jiffies 4294946869
hex dump (first 32 bytes):
08 3f 5a 10 81 88 ff ff 62 6c 6f 63 6b 2e 30 00 .?Z.....block.0.
00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 ................
backtrace (crc f7f284e3):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4597 [inline]
slab_alloc_node mm/slub.c:4917 [inline]
__kmalloc_cache_noprof+0x356/0x440 mm/slub.c:5485
_kmalloc_noprof include/linux/slab.h:988 [inline]
_kzalloc_noprof include/linux/slab.h:1309 [inline]
f_midi2_block_opts_create+0x82/0x120 drivers/usb/gadget/function/f_midi2.c:2342
f_midi2_alloc_inst+0xe9/0x250 drivers/usb/gadget/function/f_midi2.c:2673
try_get_usb_function_instance+0xb8/0x100 drivers/usb/gadget/functions.c:28
usb_get_function_instance+0x16/0x70 drivers/usb/gadget/functions.c:44
function_make+0xf5/0x240 drivers/usb/gadget/configfs.c:626
configfs_mkdir+0x2e9/0x6f0 fs/configfs/dir.c:1360
vfs_mkdir+0x16c/0x3a0 fs/namei.c:5276
filename_mkdirat+0x27c/0x300 fs/namei.c:5309
__do_sys_mkdirat fs/namei.c:5330 [inline]
__se_sys_mkdirat fs/namei.c:5327 [inline]
__x64_sys_mkdirat+0x39/0x60 fs/namei.c:5327
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf8/0x610 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF
---
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^ permalink raw reply [flat|nested] 5+ messages in thread[parent not found: <20260730144238.00004ab3@gmail.com>]
[parent not found: <20260730145955.00000a15@gmail.com>]
end of thread, other threads:[~2026-07-30 13:56 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2026-07-30 12:26 [syzbot] [usb?] memory leak in try_get_usb_function_instance syzbot
2026-07-30 12:42 ` Forwarded: syzbot
2026-07-30 12:59 ` Forwarded: syzbot
[not found] <20260730144238.00004ab3@gmail.com>
2026-07-30 12:59 ` [syzbot] [usb?] memory leak in try_get_usb_function_instance syzbot
[not found] <20260730145955.00000a15@gmail.com>
2026-07-30 13:56 ` syzbot
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