On Tue, Apr 08, 2025 at 04:53:34AM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 0af2f6be1b42 Linux 6.15-rc1 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1284523f980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=66996a2350ef05e0 > dashboard link: https://syzkaller.appspot.com/bug?extid=00778a9a557a2a5e1a33 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c9eb4c580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=179bbd98580000 > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-0af2f6be.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/3fcfb8eefe4d/vmlinux-0af2f6be.xz > kernel image: https://storage.googleapis.com/syzbot-assets/e06a39be2bd8/bzImage-0af2f6be.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+00778a9a557a2a5e1a33@xxxxxxxxxxxxxxxxxxxxxxxxx > > Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] I done some analysis and it looks like during cfg80211_conn_work() the wdev->conn->params.bssid is NULL, this gets passed to cfg80211_conn_do_work() which hits the CFG80211_CONN_ASSOC_FAILED label of the switch statement where ether_addr_equal() compares the NULL bssid via ether_addr_equal(). Regards, Qasim > CPU: 0 UID: 0 PID: 4854 Comm: kworker/0:3 Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 > Workqueue: events cfg80211_conn_work > RIP: 0010:ether_addr_equal include/linux/etherdevice.h:355 [inline] > RIP: 0010:cfg80211_mlme_deauth+0x35a/0x940 net/wireless/mlme.c:514 > Code: 8d 9c 24 b0 00 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 4c 8b 7c 24 28 0f 85 25 03 00 00 44 8b 23 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 2b 03 00 00 45 8b 37 48 8b 44 24 20 48 > RSP: 0018:ffffc90002cdf180 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: ffff888045820e40 RCX: ffff888000b5c880 > RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 > RBP: ffffc90002cdf268 R08: ffffffff8b8395d8 R09: 0000000000000003 > R10: 0000000000000009 R11: ffff888000b5c880 R12: 0000000000000000 > R13: dffffc0000000000 R14: 0000000000000003 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff88808c596000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f25d8438198 CR3: 000000001f4b4000 CR4: 0000000000352ef0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > cfg80211_conn_do_work+0x369/0xed0 net/wireless/sme.c:229 > cfg80211_conn_work+0x2c2/0x530 net/wireless/sme.c:273 > process_one_work kernel/workqueue.c:3238 [inline] > process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319 > worker_thread+0x870/0xd50 kernel/workqueue.c:3400 > kthread+0x7b7/0x940 kernel/kthread.c:464 > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:ether_addr_equal include/linux/etherdevice.h:355 [inline] > RIP: 0010:cfg80211_mlme_deauth+0x35a/0x940 net/wireless/mlme.c:514 > Code: 8d 9c 24 b0 00 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 4c 8b 7c 24 28 0f 85 25 03 00 00 44 8b 23 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 2b 03 00 00 45 8b 37 48 8b 44 24 20 48 > RSP: 0018:ffffc90002cdf180 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: ffff888045820e40 RCX: ffff888000b5c880 > RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 > RBP: ffffc90002cdf268 R08: ffffffff8b8395d8 R09: 0000000000000003 > R10: 0000000000000009 R11: ffff888000b5c880 R12: 0000000000000000 > R13: dffffc0000000000 R14: 0000000000000003 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff88808c596000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f25d8438198 CR3: 000000001f4b4000 CR4: 0000000000352ef0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: 8d 9c 24 b0 00 00 00 lea 0xb0(%rsp),%ebx > 7: 48 89 d8 mov %rbx,%rax > a: 48 c1 e8 03 shr $0x3,%rax > e: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax > 13: 84 c0 test %al,%al > 15: 4c 8b 7c 24 28 mov 0x28(%rsp),%r15 > 1a: 0f 85 25 03 00 00 jne 0x345 > 20: 44 8b 23 mov (%rbx),%r12d > 23: 4c 89 f8 mov %r15,%rax > 26: 48 c1 e8 03 shr $0x3,%rax > * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction > 2f: 84 c0 test %al,%al > 31: 0f 85 2b 03 00 00 jne 0x362 > 37: 45 8b 37 mov (%r15),%r14d > 3a: 48 8b 44 24 20 mov 0x20(%rsp),%rax > 3f: 48 rex.W > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > 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. > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup >
