[syzbot] [batman?] [bluetooth?] memory leak in skb_clone (3)

[syzbot] [batman?] [bluetooth?] memory leak in skb_clone (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    4a26e7032d7d Merge tag 'core-bugs-2025-12-01' of git://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=116a9512580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cbf343972ee89096
dashboard link: https://syzkaller.appspot.com/bug?extid=6e76aa21aaf2d8be6034
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=179be192580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15cd92b4580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3f4ff8b7d65f/disk-4a26e703.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2fbb585ef1ac/vmlinux-4a26e703.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dfdc58db78d3/bzImage-4a26e703.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e76aa21aaf2d8be6034@syzkaller.appspotmail.com

2025/12/03 00:25:54 executed programs: 5
BUG: memory leak
unreferenced object 0xffff88811a1e1100 (size 240):
  comm "kworker/u9:0", pid 51, jiffies 4294944590
  hex dump (first 32 bytes):
    90 50 50 42 81 88 ff ff 90 50 50 42 81 88 ff ff  .PPB.....PPB....
    00 00 00 00 00 00 00 00 00 50 50 42 81 88 ff ff  .........PPB....
  backtrace (crc eed28d2d):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    kmem_cache_alloc_noprof+0x397/0x5a0 mm/slub.c:5295
    skb_clone+0xae/0x2b0 net/core/skbuff.c:2050
    __skb_tstamp_tx+0x3a0/0x4c0 net/core/skbuff.c:5636
    hci_conn_tx_queue+0x11c/0x1d0 net/bluetooth/hci_conn.c:3026
    hci_send_conn_frame net/bluetooth/hci_core.c:3086 [inline]
    hci_sched_acl_pkt net/bluetooth/hci_core.c:3701 [inline]
    hci_sched_acl net/bluetooth/hci_core.c:3726 [inline]
    hci_tx_work+0x437/0x570 net/bluetooth/hci_core.c:3820
    process_one_work+0x26b/0x620 kernel/workqueue.c:3263
    process_scheduled_works kernel/workqueue.c:3346 [inline]
    worker_thread+0x2c4/0x4f0 kernel/workqueue.c:3427
    kthread+0x15b/0x310 kernel/kthread.c:463
    ret_from_fork+0x2af/0x2e0 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


---
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Forwarded: [PATCH] Bluetooth: hci_conn: Fix memory leak in tx_q on connection teardown

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: [PATCH] Bluetooth: hci_conn: Fix memory leak in tx_q on connection teardown
Author: kartikey406@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

Cloned SKBs queued in conn->tx_q.queue for TX timestamp tracking are
not freed if the connection is torn down before all completion events
arrive. Add skb_queue_purge() in hci_conn_cleanup() to fix the leak.

Reported-by: syzbot+6e76aa21aaf2d8be6034@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=6e76aa21aaf2d8be6034
Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com>
---
 net/bluetooth/hci_conn.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index c3f7828bf9d5..3fb93faf60f3 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -148,6 +148,7 @@ static void hci_conn_cleanup(struct hci_conn *conn)
 		hci_remove_link_key(hdev, &conn->dst);
 
 	hci_chan_list_flush(conn);
+	skb_queue_purge(&conn->tx_q.queue);
 
 	if (HCI_CONN_HANDLE_UNSET(conn->handle))
 		ida_free(&hdev->unset_handle_ida, conn->handle);
-- 
2.43.0

Forwarded: [PATCH] Bluetooth: hci_conn: Fix memory leak in tx_q on connection teardown

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: [PATCH] Bluetooth: hci_conn: Fix memory leak in tx_q on connection teardown
Author: kartikey406@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

Cloned SKBs queued in conn->tx_q.queue for TX timestamp tracking are
not freed if the connection is torn down before all completion events
arrive. Add skb_queue_purge() in hci_conn_cleanup() to fix the leak.

Reported-by: syzbot+6e76aa21aaf2d8be6034@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=6e76aa21aaf2d8be6034
Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com>
---
 net/bluetooth/hci_conn.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index c3f7828bf9d5..3fb93faf60f3 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -148,6 +148,7 @@ static void hci_conn_cleanup(struct hci_conn *conn)
 		hci_remove_link_key(hdev, &conn->dst);
 
 	hci_chan_list_flush(conn);
+	skb_queue_purge(&conn->tx_q.queue);
 
 	if (HCI_CONN_HANDLE_UNSET(conn->handle))
 		ida_free(&hdev->unset_handle_ida, conn->handle);
-- 
2.43.0

Forwarded: [PATCH] Bluetooth: hci_conn: Fix memory leak in tx_q on connection teardown

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: [PATCH] Bluetooth: hci_conn: Fix memory leak in tx_q on connection teardown
Author: kartikey406@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

Cloned SKBs queued in conn->tx_q.queue for TX timestamp tracking are
not freed if the connection is torn down before all completion events
arrive. Add skb_queue_purge() in hci_conn_cleanup() to fix the leak.

Reported-by: syzbot+6e76aa21aaf2d8be6034@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=6e76aa21aaf2d8be6034
Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com>
---
 net/bluetooth/hci_conn.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index c3f7828bf9d5..3fb93faf60f3 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -148,6 +148,7 @@ static void hci_conn_cleanup(struct hci_conn *conn)
 		hci_remove_link_key(hdev, &conn->dst);
 
 	hci_chan_list_flush(conn);
+	skb_queue_purge(&conn->tx_q.queue);
 
 	if (HCI_CONN_HANDLE_UNSET(conn->handle))
 		ida_free(&hdev->unset_handle_ida, conn->handle);
-- 
2.43.0

Forwarded: Re: [syzbot] [batman?] [bluetooth?] memory leak in skb_clone (3)

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Re: [syzbot] [batman?] [bluetooth?] memory leak in skb_clone (3)
Author: halves@igalia.com

#syz test: 
git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git 
master

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Forwarded: Re: [syzbot] [bluetooth?] [batman?] memory leak in skb_clone (3)

[syzbot]

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Subject: Re: [syzbot] [bluetooth?] [batman?] memory leak in skb_clone (3)
Author: halves@igalia.com

#syz test: upstream 21e4271e65094172aadd5beb8caea95dd0fbf6d7

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Forwarded: Re: [syzbot] [bluetooth?] [batman?] memory leak in skb_clone (3)

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

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Subject: Re: [syzbot] [bluetooth?] [batman?] memory leak in skb_clone (3)
Author: halves@igalia.com

#syz fix: Bluetooth: purge error queues in socket destructors

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