general protection fault in wext_handle_ioctl

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 8c2ab803 Merge tag 'orphan-handling-v5.10-rc2' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12e57870500000
kernel config: https://syzkaller.appspot.com/x/.config?x=3140f5be49a06bf9
dashboard link: https://syzkaller.appspot.com/bug?extid=8b2a88a09653d4084179
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8b2a88...@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: 10716 Comm: syz-executor.0 Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:call_commit_handler net/wireless/wext-core.c:900 [inline]
RIP: 0010:ioctl_standard_call net/wireless/wext-core.c:1029 [inline]
RIP: 0010:wireless_process_ioctl net/wireless/wext-core.c:954 [inline]
RIP: 0010:wext_ioctl_dispatch net/wireless/wext-core.c:987 [inline]
RIP: 0010:wext_handle_ioctl+0x974/0xb20 net/wireless/wext-core.c:1048
Code: e8 a1 87 a3 f8 eb 6c 48 8b 44 24 18 42 80 3c 20 00 48 8b 5c 24 20 74 08 48 89 df e8 d6 78 e5 f8 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 bd 78 e5 f8 48 8b 1b 48 89 d8 48
RSP: 0018:ffffc900018afe00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff88d17b88
RDX: ffff88801a3ccec0 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88802b398000 R08: ffffffff88d17baf R09: ffffed1005673009
R10: ffffed1005673009 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000008b04
FS: 00007f0710ce1700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ce26000 CR3: 000000001efa8000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
sock_ioctl+0xdc/0x690 net/socket.c:1119
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45de49
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f0710ce0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000013440 RCX: 000000000045de49
RDX: 00000000200000c0 RSI: 0000000000008b04 RDI: 0000000000000003
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007fff190b875f R14: 00007f0710ce19c0 R15: 000000000118bf2c
Modules linked in:
---[ end trace 82d7ada5671b3a90 ]---
RIP: 0010:call_commit_handler net/wireless/wext-core.c:900 [inline]
RIP: 0010:ioctl_standard_call net/wireless/wext-core.c:1029 [inline]
RIP: 0010:wireless_process_ioctl net/wireless/wext-core.c:954 [inline]
RIP: 0010:wext_ioctl_dispatch net/wireless/wext-core.c:987 [inline]
RIP: 0010:wext_handle_ioctl+0x974/0xb20 net/wireless/wext-core.c:1048
Code: e8 a1 87 a3 f8 eb 6c 48 8b 44 24 18 42 80 3c 20 00 48 8b 5c 24 20 74 08 48 89 df e8 d6 78 e5 f8 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 bd 78 e5 f8 48 8b 1b 48 89 d8 48
RSP: 0018:ffffc900018afe00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff88d17b88
RDX: ffff88801a3ccec0 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88802b398000 R08: ffffffff88d17baf R09: ffffed1005673009
R10: ffffed1005673009 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000008b04
FS: 00007f0710ce1700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f04025f6000 CR3: 000000001efa8000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: e28c0d7c Merge branch 'akpm' (patches from Andrew)
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15cd1cc2500000
kernel config: https://syzkaller.appspot.com/x/.config?x=37bf5609aacce0b6

dashboard link: https://syzkaller.appspot.com/bug?extid=8b2a88a09653d4084179
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13706da1500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10229fdc500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8b2a88...@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: 0 PID: 8462 Comm: syz-executor301 Not tainted 5.10.0-rc3-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:call_commit_handler net/wireless/wext-core.c:900 [inline]
RIP: 0010:ioctl_standard_call net/wireless/wext-core.c:1029 [inline]
RIP: 0010:wireless_process_ioctl net/wireless/wext-core.c:954 [inline]
RIP: 0010:wext_ioctl_dispatch net/wireless/wext-core.c:987 [inline]
RIP: 0010:wext_handle_ioctl+0x974/0xb20 net/wireless/wext-core.c:1048

Code: e8 61 1d a3 f8 eb 6c 48 8b 44 24 18 42 80 3c 20 00 48 8b 5c 24 20 74 08 48 89 df e8 26 16 e5 f8 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 0d 16 e5 f8 48 8b 1b 48 89 d8 48
RSP: 0018:ffffc9000143fe00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff88d1ed88
RDX: ffff8880290e8000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88801b738000 R08: ffffffff88d1edaf R09: ffffed10036e7009
R10: ffffed10036e7009 R11: 0000000000000000 R12: dffffc0000000000

R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000008b04

FS: 0000000001eb8880(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007ffd3b2be000 CR3: 0000000024723000 CR4: 00000000001506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
sock_ioctl+0xdc/0x690 net/socket.c:1119
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

RIP: 0033:0x441529
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 8b 0d fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffeab8016d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffeab801700 RCX: 0000000000441529

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 d1b799cc496836f9 ]---

RIP: 0010:call_commit_handler net/wireless/wext-core.c:900 [inline]
RIP: 0010:ioctl_standard_call net/wireless/wext-core.c:1029 [inline]
RIP: 0010:wireless_process_ioctl net/wireless/wext-core.c:954 [inline]
RIP: 0010:wext_ioctl_dispatch net/wireless/wext-core.c:987 [inline]
RIP: 0010:wext_handle_ioctl+0x974/0xb20 net/wireless/wext-core.c:1048

Code: e8 61 1d a3 f8 eb 6c 48 8b 44 24 18 42 80 3c 20 00 48 8b 5c 24 20 74 08 48 89 df e8 26 16 e5 f8 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 0d 16 e5 f8 48 8b 1b 48 89 d8 48
RSP: 0018:ffffc9000143fe00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff88d1ed88
RDX: ffff8880290e8000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88801b738000 R08: ffffffff88d1edaf R09: ffffed10036e7009
R10: ffffed10036e7009 R11: 0000000000000000 R12: dffffc0000000000

R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000008b04

FS: 0000000001eb8880(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007ffd3b2be000 CR3: 0000000024723000 CR4: 00000000001506f0

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+8b2a88...@syzkaller.appspotmail.com

Tested on:

commit: 131ad0b6 Merge tag 'acpi-5.10-rc5' of git://git.kernel.org..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=e93bbe4ce29223b

dashboard link: https://syzkaller.appspot.com/bug?extid=8b2a88a09653d4084179
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)

patch: https://syzkaller.appspot.com/x/patch.diff?x=10ce581c500000

Note: testing is done by a robot and is best-effort only.

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in wext_handle_ioctl

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]

CPU: 0 PID: 10214 Comm: syz-executor.3 Not tainted 5.10.0-rc4-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:call_commit_handler net/wireless/wext-core.c:900 [inline]
RIP: 0010:ioctl_standard_call net/wireless/wext-core.c:1029 [inline]
RIP: 0010:wireless_process_ioctl net/wireless/wext-core.c:954 [inline]
RIP: 0010:wext_ioctl_dispatch net/wireless/wext-core.c:987 [inline]
RIP: 0010:wext_handle_ioctl+0x974/0xb20 net/wireless/wext-core.c:1048

Code: e8 f1 18 a3 f8 eb 6c 48 8b 44 24 18 42 80 3c 20 00 48 8b 5c 24 20 74 08 48 89 df e8 16 0c e5 f8 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 fd 0b e5 f8 48 8b 1b 48 89 d8 48
RSP: 0018:ffffc9000a9afe00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff88d20748
RDX: ffff88802dce1a40 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff888027460000 R08: ffffffff88d2076f R09: ffffed1004e8c009
R10: ffffed1004e8c009 R11: 0000000000000000 R12: dffffc0000000000

R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000008b04

FS: 00007f580e50d700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000562220a16160 CR3: 0000000018876000 CR4: 00000000001506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
sock_ioctl+0xdc/0x690 net/socket.c:1119
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

RIP: 0033:0x45deb9
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f580e50cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000013440 RCX: 000000000045deb9

RDX: 00000000200000c0 RSI: 0000000000008b04 RDI: 0000000000000003

RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffe10b72b7f R14: 00007f580e50d9c0 R15: 000000000118bf2c
Modules linked in:
---[ end trace fa920c668484b743 ]---

RIP: 0010:call_commit_handler net/wireless/wext-core.c:900 [inline]
RIP: 0010:ioctl_standard_call net/wireless/wext-core.c:1029 [inline]
RIP: 0010:wireless_process_ioctl net/wireless/wext-core.c:954 [inline]
RIP: 0010:wext_ioctl_dispatch net/wireless/wext-core.c:987 [inline]
RIP: 0010:wext_handle_ioctl+0x974/0xb20 net/wireless/wext-core.c:1048

Code: e8 f1 18 a3 f8 eb 6c 48 8b 44 24 18 42 80 3c 20 00 48 8b 5c 24 20 74 08 48 89 df e8 16 0c e5 f8 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 fd 0b e5 f8 48 8b 1b 48 89 d8 48
RSP: 0018:ffffc9000a9afe00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff88d20748
RDX: ffff88802dce1a40 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff888027460000 R08: ffffffff88d2076f R09: ffffed1004e8c009
R10: ffffed1004e8c009 R11: 0000000000000000 R12: dffffc0000000000

R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000008b04

FS: 00007f580e50d700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f41acc96008 CR3: 0000000018876000 CR4: 00000000001506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Tested on:

commit: 3494d588 Merge tag 'xtensa-20201119' of git://github.com/j..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15ab865e500000