Subject: [syzbot] BUG: unable to handle kernel paging request in ipcomp_free_scratches

From: syzbot <[email-masked]>
Date: Mon, 09 Aug 2021 02:15:21 -0700

Hello,

syzbot found the following issue on:

HEAD commit:    1159e25c1374 qede: fix crash in rmmod qede while automatic..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=10870601300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bfd78f4abd4edaa6
dashboard link: https://syzkaller.appspot.com/bug?extid=b9cfd1cc5d57ee0a09ab
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1

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: [email-masked]

netlink: 'syz-executor.1': attribute type 5 has an invalid length.
BUG: unable to handle page fault for address: ffffe8fffe8ff008
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 1083f067 P4D 1083f067 PUD 18f72067 PMD 61e2b067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7380 Comm: syz-executor.1 Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ipcomp_free_scratches+0xbc/0x160 net/xfrm/xfrm_ipcomp.c:203
Code: fa 48 c1 ea 03 80 3c 1a 00 0f 85 99 00 00 00 4a 8b 04 fd 80 48 31 8b 4c 01 f0 48 89 c2 49 89 c7 48 c1 ea 03 80 3c 1a 00 75 74 <49> 8b 3f e8 5c 1c e5 f9 e8 f7 c0 a9 f9 89 ef 48 c7 c6 58 70 6c 8d
RSP: 0018:ffffc900024c7530 EFLAGS: 00010246
RAX: ffffe8fffe8ff008 RBX: dffffc0000000000 RCX: ffffc9000bbf5000
RDX: 1ffffd1fffd1fe01 RSI: ffffffff87cbda1b RDI: ffffffff8b314880
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff87cbda98 R11: 0000000000000001 R12: 0000000000000007
R13: fffffbfff1ad8e44 R14: 0000607f44cff008 R15: ffffe8fffe8ff008
FS:  00007fa69c568700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffe8fffe8ff008 CR3: 000000006ffee000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ipcomp_free_data net/xfrm/xfrm_ipcomp.c:312 [inline]
 ipcomp_init_state+0x77c/0xa40 net/xfrm/xfrm_ipcomp.c:364
 ipcomp6_init_state+0xc2/0x700 net/ipv6/ipcomp6.c:154
 __xfrm_init_state+0x995/0x15c0 net/xfrm/xfrm_state.c:2648
 xfrm_init_state+0x1a/0x70 net/xfrm/xfrm_state.c:2675
 pfkey_msg2xfrm_state net/key/af_key.c:1287 [inline]
 pfkey_add+0x1a64/0x2cd0 net/key/af_key.c:1504
 pfkey_process+0x685/0x7e0 net/key/af_key.c:2837
 pfkey_sendmsg+0x43a/0x820 net/key/af_key.c:3676
 sock_sendmsg_nosec net/socket.c:703 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:723
 ____sys_sendmsg+0x331/0x810 net/socket.c:2392
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446
 __sys_sendmmsg+0x195/0x470 net/socket.c:2532
 __do_sys_sendmmsg net/socket.c:2561 [inline]
 __se_sys_sendmmsg net/socket.c:2558 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2558
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa69c568188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9
RDX: 0000000000000393 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007fffa498908f R14: 00007fa69c568300 R15: 0000000000022000
Modules linked in:
CR2: ffffe8fffe8ff008
---[ end trace 9d9c0a7eca692b29 ]---
RIP: 0010:ipcomp_free_scratches+0xbc/0x160 net/xfrm/xfrm_ipcomp.c:203
Code: fa 48 c1 ea 03 80 3c 1a 00 0f 85 99 00 00 00 4a 8b 04 fd 80 48 31 8b 4c 01 f0 48 89 c2 49 89 c7 48 c1 ea 03 80 3c 1a 00 75 74 <49> 8b 3f e8 5c 1c e5 f9 e8 f7 c0 a9 f9 89 ef 48 c7 c6 58 70 6c 8d
RSP: 0018:ffffc900024c7530 EFLAGS: 00010246
RAX: ffffe8fffe8ff008 RBX: dffffc0000000000 RCX: ffffc9000bbf5000
RDX: 1ffffd1fffd1fe01 RSI: ffffffff87cbda1b RDI: ffffffff8b314880
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff87cbda98 R11: 0000000000000001 R12: 0000000000000007
R13: fffffbfff1ad8e44 R14: 0000607f44cff008 R15: ffffe8fffe8ff008
FS:  00007fa69c568700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffe8fffe8ff008 CR3: 000000006ffee000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

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