general protection fault in call_commit_handler

general protection fault in call_commit_handler

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    9ff9b0d3 Merge tag 'net-next-5.10' of git://git.kernel.org..
git tree:       bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12377207900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=10a98dcaa4fa65a2
dashboard link: https://syzkaller.appspot.com/bug?extid=444248c79e117bc99f46
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=105d15a4500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11973e78500000

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10bd270c500000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=12bd270c500000
console output: https://syzkaller.appspot.com/x/log.txt?x=14bd270c500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+444248c79e117bc99f46@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 8503 Comm: syz-executor669 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:call_commit_handler+0x8b/0x110 net/wireless/wext-core.c:900
Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 7d 48 8b 9d e0 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 75 73 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 89 da
RSP: 0018:ffffc90001927ca8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8844a758
RDX: 0000000000000000 RSI: ffffffff8844a765 RDI: ffff88809b6f81e0
RBP: ffff88809b6f8000 R08: 0000000000000000 R09: ffff88809b6f8047
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88809b6f8040
R13: ffffc90001927db0 R14: ffff88809b6f8000 R15: 0000000000000004
FS:  0000000000725880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200000c0 CR3: 00000000aabca000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ioctl_standard_call+0x1b8/0x1f0 net/wireless/wext-core.c:1029
 wireless_process_ioctl+0xc8/0x4c0 net/wireless/wext-core.c:954
 wext_ioctl_dispatch net/wireless/wext-core.c:987 [inline]
 wext_ioctl_dispatch net/wireless/wext-core.c:975 [inline]
 wext_handle_ioctl+0x26b/0x280 net/wireless/wext-core.c:1048
 sock_ioctl+0x439/0x730 net/socket.c:1119
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x441549
Code: e8 ec 05 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 0d fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffec8be6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffec8be6050 RCX: 0000000000441549
RDX: 00000000200000c0 RSI: 0000000000008b04 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000002000000000 R09: 0000002000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000032
R13: 0000000000000000 R14: 000000000000000c R15: 0000000000000004
Modules linked in:
---[ end trace e41146864548f580 ]---
RIP: 0010:call_commit_handler+0x8b/0x110 net/wireless/wext-core.c:900
Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 7d 48 8b 9d e0 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 75 73 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 89 da
RSP: 0018:ffffc90001927ca8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8844a758
RDX: 0000000000000000 RSI: ffffffff8844a765 RDI: ffff88809b6f81e0
RBP: ffff88809b6f8000 R08: 0000000000000000 R09: ffff88809b6f8047
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88809b6f8040
R13: ffffc90001927db0 R14: ffff88809b6f8000 R15: 0000000000000004
FS:  0000000000725880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f952003c058 CR3: 00000000aabca000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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