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Date: Mon, 17 Jun 2024 14:22:17 -0700 From: syzbot <syzbot+49092daf3dd0a57f9e73@...kaller.appspotmail.com> To: johan.hedberg@...il.com, linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org, luiz.dentz@...il.com, marcel@...tmann.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [bluetooth?] general protection fault in l2cap_publish_rx_avail syzbot has found a reproducer for the following issue on: HEAD commit: 2ccbdf43d5e7 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=175822fa980000 kernel config: https://syzkaller.appspot.com/x/.config?x=b8786f381e62940f dashboard link: https://syzkaller.appspot.com/bug?extid=49092daf3dd0a57f9e73 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164f8251980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10b077ee980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-2ccbdf43.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c40c1cd990d2/vmlinux-2ccbdf43.xz kernel image: https://storage.googleapis.com/syzbot-assets/a2a94050804e/bzImage-2ccbdf43.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+49092daf3dd0a57f9e73@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000000002e: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000170-0x0000000000000177] CPU: 0 PID: 5191 Comm: kworker/u33:2 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: hci0 hci_rx_work RIP: 0010:l2cap_publish_rx_avail+0x4f/0x1c0 net/bluetooth/l2cap_sock.c:1137 Code: 03 80 3c 02 00 0f 85 86 01 00 00 48 8b ab a0 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd 74 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a RSP: 0018:ffffc900032d7978 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff88802a115000 RCX: ffffffff88bb942d RDX: 000000000000002e RSI: ffffffff89e760be RDI: 0000000000000174 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000003 R12: ffff88802a114000 R13: ffff8880118868c0 R14: ffff88802a11502e R15: ffff8880118868c0 FS: 0000000000000000(0000) GS:ffff88806b000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555926f16c8 CR3: 0000000022a3c000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> l2cap_sock_recv_cb+0x104/0x3d0 net/bluetooth/l2cap_sock.c:1509 l2cap_conless_channel net/bluetooth/l2cap_core.c:6780 [inline] l2cap_recv_frame+0x20cb/0xa190 net/bluetooth/l2cap_core.c:6833 l2cap_recv_acldata+0x9ac/0xb60 net/bluetooth/l2cap_core.c:7516 hci_acldata_packet net/bluetooth/hci_core.c:3842 [inline] hci_rx_work+0xaa7/0x1610 net/bluetooth/hci_core.c:4079 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 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:l2cap_publish_rx_avail+0x4f/0x1c0 net/bluetooth/l2cap_sock.c:1137 Code: 03 80 3c 02 00 0f 85 86 01 00 00 48 8b ab a0 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd 74 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3a RSP: 0018:ffffc900032d7978 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff88802a115000 RCX: ffffffff88bb942d RDX: 000000000000002e RSI: ffffffff89e760be RDI: 0000000000000174 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000003 R12: ffff88802a114000 R13: ffff8880118868c0 R14: ffff88802a11502e R15: ffff8880118868c0 FS: 0000000000000000(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f51d7775348 CR3: 000000000d97a000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax 6: 85 86 01 00 00 48 test %eax,0x48000001(%rsi) c: 8b ab a0 04 00 00 mov 0x4a0(%rbx),%ebp 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 48 8d bd 74 01 00 00 lea 0x174(%rbp),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2e: 48 89 f8 mov %rdi,%rax 31: 83 e0 07 and $0x7,%eax 34: 83 c0 03 add $0x3,%eax 37: 38 d0 cmp %dl,%al 39: 7c 08 jl 0x43 3b: 84 d2 test %dl,%dl 3d: 0f .byte 0xf 3e: 85 3a test %edi,(%rdx) --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
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