[syzbot] general protection fault in rose_transmit_link (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: cb8092d70a6f tipc: move bc link creation back to tipc_node..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=115d4c18080000
kernel config: https://syzkaller.appspot.com/x/.config?x=542d3d75f0e6f36f
dashboard link: https://syzkaller.appspot.com/bug?extid=677921bcd8c3a67a3df3
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

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+677921...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 PID: 4101 Comm: syz-executor.0 Not tainted 5.19.0-rc3-syzkaller-00134-gcb8092d70a6f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rose_transmit_link+0x2e/0x5e0 net/rose/rose_link.c:263
Code: 41 55 41 54 49 89 fc 55 48 89 f5 53 48 83 ec 08 e8 a7 5c 30 f9 48 8d 7d 32 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 ce 04 00 00
RSP: 0018:ffffc90005887a40 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88803022c85a RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff884a18e9 RDI: 0000000000000032
RBP: 0000000000000000 R08: 0000000000000005 R09: 000000000000001f
R10: 0000000000000013 R11: 0000000000000000 R12: ffff888047e9f780
R13: 0000000000000010 R14: 0000000000000013 R15: ffff88807a854000
FS: 00007f000df57700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f038 CR3: 0000000037cae000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
rose_write_internal+0x272/0x1890 net/rose/rose_subr.c:198
rose_release+0x1ba/0x4c0 net/rose/af_rose.c:634
__sock_release+0xcd/0x280 net/socket.c:650
sock_close+0x18/0x20 net/socket.c:1365
__fput+0x277/0x9d0 fs/file_table.c:317
task_work_run+0xdd/0x1a0 kernel/task_work.c:177
get_signal+0x1c5/0x2600 kernel/signal.c:2634
arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869
exit_to_user_mode_loop kernel/entry/common.c:166 [inline]
exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201
__syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f000ce89109
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f000df57168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: 0000000000000000 RBX: 00007f000cf9c030 RCX: 00007f000ce89109
RDX: 0000000000000040 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 00007f000cee305d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda3cdf48f R14: 00007f000df57300 R15: 0000000000022000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rose_transmit_link+0x2e/0x5e0 net/rose/rose_link.c:263
Code: 41 55 41 54 49 89 fc 55 48 89 f5 53 48 83 ec 08 e8 a7 5c 30 f9 48 8d 7d 32 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 ce 04 00 00
RSP: 0018:ffffc90005887a40 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88803022c85a RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff884a18e9 RDI: 0000000000000032
RBP: 0000000000000000 R08: 0000000000000005 R09: 000000000000001f
R10: 0000000000000013 R11: 0000000000000000 R12: ffff888047e9f780
R13: 0000000000000010 R14: 0000000000000013 R15: ffff88807a854000
FS: 00007f000df57700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e925000 CR3: 0000000037cae000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 41 55 push %r13
2: 41 54 push %r12
4: 49 89 fc mov %rdi,%r12
7: 55 push %rbp
8: 48 89 f5 mov %rsi,%rbp
b: 53 push %rbx
c: 48 83 ec 08 sub $0x8,%rsp
10: e8 a7 5c 30 f9 callq 0xf9305cbc
15: 48 8d 7d 32 lea 0x32(%rbp),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 48 89 fa mov %rdi,%rdx
31: 83 e2 07 and $0x7,%edx
34: 38 d0 cmp %dl,%al
36: 7f 08 jg 0x40
38: 84 c0 test %al,%al
3a: 0f 85 ce 04 00 00 jne 0x50e


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