Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in hci_send_acl Bluetooth: Unknown BR/EDR signaling command 0x0d Bluetooth: Wrong link type (-22) Bluetooth: Unknown BR/EDR signaling command 0x0f Bluetooth: Wrong link type (-22) Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 6555 Comm: kworker/u9:3 Not tainted 6.13.0-rc7-syzkaller-00102-gce69b4019001-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: hci3 hci_rx_work RIP: 0010:hci_send_acl+0x3e/0xd00 net/bluetooth/hci_core.c:3232 Code: 00 89 54 24 04 49 89 f5 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 e2 91 e6 f6 48 89 5c 24 18 4c 8d 73 18 4c 89 f3 48 c1 eb 03 <42> 80 3c 3b 00 74 08 4c 89 f7 e8 03 fc 4c f7 bd f8 0f 00 00 49 03 RSP: 0018:ffffc90003627238 EFLAGS: 00010206 RAX: ffffffff8ab8f08e RBX: 0000000000000003 RCX: ffff88802f890000 RDX: 0000000000000000 RSI: ffff888029522b40 RDI: 0000000000000000 RBP: ffffc90003627a10 R08: ffffffff8ac38ee4 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed100e8028c3 R12: ffff888031548629 R13: ffff888029522b40 R14: 0000000000000018 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2c547452d8 CR3: 000000000e736000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> l2cap_sig_send_rej net/bluetooth/l2cap_core.c:5502 [inline] l2cap_sig_channel net/bluetooth/l2cap_core.c:5538 [inline] l2cap_recv_frame+0x221f/0x10db0 net/bluetooth/l2cap_core.c:6817 l2cap_recv_acldata+0x700/0x1a50 net/bluetooth/l2cap_core.c:7524 hci_acldata_packet net/bluetooth/hci_core.c:3797 [inline] hci_rx_work+0x508/0xdb0 net/bluetooth/hci_core.c:4040 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hci_send_acl+0x3e/0xd00 net/bluetooth/hci_core.c:3232 Code: 00 89 54 24 04 49 89 f5 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 e2 91 e6 f6 48 89 5c 24 18 4c 8d 73 18 4c 89 f3 48 c1 eb 03 <42> 80 3c 3b 00 74 08 4c 89 f7 e8 03 fc 4c f7 bd f8 0f 00 00 49 03 RSP: 0018:ffffc90003627238 EFLAGS: 00010206 RAX: ffffffff8ab8f08e RBX: 0000000000000003 RCX: ffff88802f890000 RDX: 0000000000000000 RSI: ffff888029522b40 RDI: 0000000000000000 RBP: ffffc90003627a10 R08: ffffffff8ac38ee4 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed100e8028c3 R12: ffff888031548629 R13: ffff888029522b40 R14: 0000000000000018 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564e8bb3fdc8 CR3: 000000000e736000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 89 54 24 04 49 add %cl,0x49042454(%rcx) 6: 89 f5 mov %esi,%ebp 8: 48 89 fb mov %rdi,%rbx b: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 12: fc ff df 15: e8 e2 91 e6 f6 call 0xf6e691fc 1a: 48 89 5c 24 18 mov %rbx,0x18(%rsp) 1f: 4c 8d 73 18 lea 0x18(%rbx),%r14 23: 4c 89 f3 mov %r14,%rbx 26: 48 c1 eb 03 shr $0x3,%rbx * 2a: 42 80 3c 3b 00 cmpb $0x0,(%rbx,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 03 fc 4c f7 call 0xf74cfc3c 39: bd f8 0f 00 00 mov $0xff8,%ebp 3e: 49 rex.WB 3f: 03 .byte 0x3 Tested on: commit: ce69b401 Merge tag 'net-6.13-rc8' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10e782b0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=aadf89e2f6db86cc dashboard link: https://syzkaller.appspot.com/bug?extid=31c2f641b850a348a734 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=154721f8580000
