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KASAN: null-ptr-deref Read in x25_connect

Status: auto-closed as invalid on 2020/02/11 19:17
Subsystems: x25
[Documentation on labels]
Reported-by: syzbot+777a2aab6ffd397407b5@syzkaller.appspotmail.com
First crash: 2121d, last: 1959d
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
Reminder: 5 open syzbot bugs in "net/x25" subsystem 1 (1) 2019/07/24 02:28
KASAN: null-ptr-deref Read in x25_connect 2 (3) 2019/06/11 13:28

Sample crash report:
==================================================================
BUG: KASAN: null-ptr-deref in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
BUG: KASAN: null-ptr-deref in refcount_sub_and_test_checked+0x87/0x200 lib/refcount.c:182
Read of size 4 at addr 00000000000000c8 by task syz-executor.0/13547

CPU: 0 PID: 13547 Comm: syz-executor.0 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 __kasan_report.cold+0x5/0x41 mm/kasan/report.c:510
 kasan_report+0x12/0x20 mm/kasan/common.c:634
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
 __kasan_check_read+0x11/0x20 mm/kasan/common.c:92
 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
 refcount_sub_and_test_checked+0x87/0x200 lib/refcount.c:182
 refcount_dec_and_test_checked+0x1b/0x20 lib/refcount.c:220
 x25_neigh_put include/net/x25.h:252 [inline]
 x25_connect+0x8de/0xed0 net/x25/af_x25.c:820
 __sys_connect+0x264/0x330 net/socket.c:1828
 __do_sys_connect net/socket.c:1839 [inline]
 __se_sys_connect net/socket.c:1836 [inline]
 __x64_sys_connect+0x73/0xb0 net/socket.c:1836
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff24fd80c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219
RDX: 0000000000000012 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff24fd816d4
R13: 00000000004c0ab1 R14: 00000000004d3508 R15: 00000000ffffffff
==================================================================

Crashes (489):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/11/13 19:16 net-old 6d6dd528d5af 048f2d49 .config console log report ci-upstream-net-this-kasan-gce
2019/10/09 18:37 net-old 4123f637a512 312c6a5a .config console log report ci-upstream-net-this-kasan-gce
2019/10/04 08:11 net-old 3afb09618840 fc17ba49 .config console log report ci-upstream-net-this-kasan-gce
2019/09/25 12:16 net-old 5aafeb74b5bb e38a6630 .config console log report ci-upstream-net-this-kasan-gce
2019/09/19 21:39 net-old b41dae061bbd eb940044 .config console log report ci-upstream-net-this-kasan-gce
2019/09/11 09:19 net-old f794dc2304d8 a60cb4cd .config console log report ci-upstream-net-this-kasan-gce
2019/09/07 21:31 net-old 0c04eb72d332 a60cb4cd .config console log report ci-upstream-net-this-kasan-gce
2019/09/06 07:39 net-old 7bdf4de12677 040fda58 .config console log report ci-upstream-net-this-kasan-gce
2019/09/06 01:33 net-old 7bdf4de12677 040fda58 .config console log report ci-upstream-net-this-kasan-gce
2019/09/05 20:30 net-old 7bdf4de12677 040fda58 .config console log report ci-upstream-net-this-kasan-gce
2019/09/03 04:30 net-old e1e54ec7fb55 14544a56 .config console log report ci-upstream-net-this-kasan-gce
2019/09/02 14:59 net-old dd7078f05e1b db7c31ca .config console log report ci-upstream-net-this-kasan-gce
2019/09/02 12:33 net-old dd7078f05e1b db7c31ca .config console log report ci-upstream-net-this-kasan-gce
2019/09/02 11:22 net-old dd7078f05e1b db7c31ca .config console log report ci-upstream-net-this-kasan-gce
2019/09/02 11:06 net-old dd7078f05e1b db7c31ca .config console log report ci-upstream-net-this-kasan-gce
2019/09/02 03:31 net-old dd7078f05e1b bad3cce2 .config console log report ci-upstream-net-this-kasan-gce
2019/09/01 17:16 net-old 879c3808a4a1 bad3cce2 .config console log report ci-upstream-net-this-kasan-gce
2019/09/01 04:26 net-old 5f81d5455589 bad3cce2 .config console log report ci-upstream-net-this-kasan-gce
2019/09/01 01:48 net-old 5f81d5455589 bad3cce2 .config console log report ci-upstream-net-this-kasan-gce
2019/08/31 18:36 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/31 17:15 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/31 12:22 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/31 10:50 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/31 08:00 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/31 05:21 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/31 00:55 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/30 22:02 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/30 09:11 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/30 07:46 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/30 01:41 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/29 23:56 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/29 22:55 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/29 21:41 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/29 19:59 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/29 02:14 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/29 00:28 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/28 13:00 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/28 09:24 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/08/28 07:47 net-old 9e8312f5e160 fd37b39e .config console log report ci-upstream-net-this-kasan-gce
2019/06/05 00:44 net-old f4cfcfbdf03c e41a20c5 .config console log report ci-upstream-net-this-kasan-gce
2019/09/23 05:55 net-next-old b41dae061bbd d96e88f3 .config console log report ci-upstream-net-kasan-gce
2019/09/16 03:36 net-next-old a3d3c74da49c 32d59357 .config console log report ci-upstream-net-kasan-gce
2019/09/15 01:03 net-next-old 1ba569fc2250 32d59357 .config console log report ci-upstream-net-kasan-gce
2019/09/14 17:37 net-next-old 1ba569fc2250 32d59357 .config console log report ci-upstream-net-kasan-gce
2019/09/14 08:03 net-next-old 022c10d6c73b 32d59357 .config console log report ci-upstream-net-kasan-gce
2019/09/11 04:24 net-next-old 074be7fd99a2 a60cb4cd .config console log report ci-upstream-net-kasan-gce
2019/09/09 07:22 net-next-old 6703a605b5ab a60cb4cd .config console log report ci-upstream-net-kasan-gce
2019/09/04 16:23 net-next-old 2c1f9e263444 12381952 .config console log report ci-upstream-net-kasan-gce
2019/09/03 17:40 net-next-old 67538eb5c00f 48448e71 .config console log report ci-upstream-net-kasan-gce
2019/09/03 00:49 net-next-old a21cf11bc57f 14544a56 .config console log report ci-upstream-net-kasan-gce
2019/09/02 08:30 net-next-old 4bc61b0b1695 db7c31ca .config console log report ci-upstream-net-kasan-gce
* Struck through repros no longer work on HEAD.