KASAN: use-after-free Read in tipc_named_reinit

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 2303d908 ANDROID: Incremental fs: Remove C++-style comments
git tree: android-5.4
console output: https://syzkaller.appspot.com/x/log.txt?x=17c4cce6e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=8afbf421d629f79a
dashboard link: https://syzkaller.appspot.com/bug?extid=521fa444d703c8285639
compiler: Android (6032204 based on r370808) clang version 10.0.1 (https://android.googlesource.com/toolchain/llvm-project 6e765c10313d15c02ab29977a82938f66742c3a9)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16b61785e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+521fa4...@syzkaller.appspotmail.com

tipc: 32-bit node address hash set to faff1eac
==================================================================
BUG: KASAN: use-after-free in tipc_named_reinit+0x1aa/0x360 net/tipc/name_distr.c:344
Read of size 8 at addr ffff8881cbd56000 by task kworker/0:28/4570

CPU: 0 PID: 4570 Comm: kworker/0:28 Not tainted 5.4.17-syzkaller-00005-g2303d908db80 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events tipc_net_finalize_work
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1b0/0x228 lib/dump_stack.c:118
print_address_description+0x96/0x5d0 mm/kasan/report.c:374
__kasan_report+0x14b/0x1c0 mm/kasan/report.c:506
kasan_report+0x26/0x50 mm/kasan/common.c:634
__asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
tipc_named_reinit+0x1aa/0x360 net/tipc/name_distr.c:344
tipc_net_finalize+0xcb/0x130 net/tipc/net.c:138
tipc_net_finalize_work+0x54/0x80 net/tipc/net.c:150
process_one_work+0x9d8/0x1030 kernel/workqueue.c:2270
worker_thread+0xbbc/0x1610 kernel/workqueue.c:2416
kthread+0x31a/0x340 kernel/kthread.c:255
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4570 Comm: kworker/0:28 Not tainted 5.4.17-syzkaller-00005-g2303d908db80 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events tipc_net_finalize_work
RIP: 0010:nearest_obj include/linux/slub_def.h:176 [inline]
RIP: 0010:print_address_description+0x41c/0x5d0 mm/kasan/report.c:379
Code: f7 01 00 02 00 00 0f 84 c6 fc ff ff 4c 8b 63 18 48 89 d8 48 c1 e0 06 48 b9 00 00 00 00 80 08 05 00 48 01 c1 4c 89 f0 48 29 c8 <41> 8b 7c 24 18 48 99 48 f7 ff 4c 89 f0 48 29 d0 0f b7 73 2a 81 e6
RSP: 0018:ffff8881d1907b10 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffea00072f5580 RCX: ffff8881cbd56000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8881d1907bc0 R08: ffffffff812cf880 R09: ffffed103b743e92
R10: ffffed103b743e92 R11: 0000000000000000 R12: dead000000000400
R13: 0000000000000008 R14: ffff8881cbd56000 R15: ffff8881cbd56000
FS: 0000000000000000(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000758080 CR3: 00000001d7532004 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__kasan_report+0x14b/0x1c0 mm/kasan/report.c:506
kasan_report+0x26/0x50 mm/kasan/common.c:634
__asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
tipc_named_reinit+0x1aa/0x360 net/tipc/name_distr.c:344
tipc_net_finalize+0xcb/0x130 net/tipc/net.c:138
tipc_net_finalize_work+0x54/0x80 net/tipc/net.c:150
process_one_work+0x9d8/0x1030 kernel/workqueue.c:2270
worker_thread+0xbbc/0x1610 kernel/workqueue.c:2416
kthread+0x31a/0x340 kernel/kthread.c:255
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 402d44389b4b6cfa ]---
RIP: 0010:nearest_obj include/linux/slub_def.h:176 [inline]
RIP: 0010:print_address_description+0x41c/0x5d0 mm/kasan/report.c:379
Code: f7 01 00 02 00 00 0f 84 c6 fc ff ff 4c 8b 63 18 48 89 d8 48 c1 e0 06 48 b9 00 00 00 00 80 08 05 00 48 01 c1 4c 89 f0 48 29 c8 <41> 8b 7c 24 18 48 99 48 f7 ff 4c 89 f0 48 29 d0 0f b7 73 2a 81 e6
RSP: 0018:ffff8881d1907b10 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffea00072f5580 RCX: ffff8881cbd56000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8881d1907bc0 R08: ffffffff812cf880 R09: ffffed103b743e92
R10: ffffed103b743e92 R11: 0000000000000000 R12: dead000000000400
R13: 0000000000000008 R14: ffff8881cbd56000 R15: ffff8881cbd56000
FS: 0000000000000000(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000758080 CR3: 00000001d7532004 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug 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 syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.