syzbot


KASAN: null-ptr-deref Write in udf_bread

Status: auto-obsoleted due to no activity on 2023/04/23 14:58
Subsystems: udf
[Documentation on labels]
Reported-by: syzbot+eb2cefea50bed497d7ca@syzkaller.appspotmail.com
First crash: 482d, last: 482d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: null-ptr-deref Write in udf_bread origin:upstream missing-backport C done 5 19d 265d 0/3 upstream: reported C repro on 2023/08/28 19:44
linux-5.15 KASAN: null-ptr-deref Write in udf_bread origin:lts-only C done 2 19d 19d 0/3 upstream: reported C repro on 2024/04/30 17:16

Sample crash report:
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: null-ptr-deref in test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:57 [inline]
BUG: KASAN: null-ptr-deref in trylock_buffer include/linux/buffer_head.h:390 [inline]
BUG: KASAN: null-ptr-deref in lock_buffer include/linux/buffer_head.h:396 [inline]
BUG: KASAN: null-ptr-deref in udf_getblk fs/udf/inode.c:469 [inline]
BUG: KASAN: null-ptr-deref in udf_bread+0x2e9/0x510 fs/udf/inode.c:1195
Write of size 8 at addr 0000000000000000 by task syz-executor.5/29768

CPU: 1 PID: 29768 Comm: syz-executor.5 Not tainted 6.2.0-rc5-syzkaller-00013-g2475bf0250de #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106
 print_report+0xed/0x1f0 mm/kasan/report.c:420
 kasan_report+0xcd/0x100 mm/kasan/report.c:517
 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:57 [inline]
 trylock_buffer include/linux/buffer_head.h:390 [inline]
 lock_buffer include/linux/buffer_head.h:396 [inline]
 udf_getblk fs/udf/inode.c:469 [inline]
 udf_bread+0x2e9/0x510 fs/udf/inode.c:1195
 udf_add_entry+0x1c97/0x3300 fs/udf/namei.c:495
 udf_add_nondir+0xfc/0x580 fs/udf/namei.c:588
 lookup_open fs/namei.c:3413 [inline]
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0x12ac/0x2dd0 fs/namei.c:3711
 do_filp_open+0x264/0x4f0 fs/namei.c:3741
 do_sys_openat2+0x124/0x4e0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_creat fs/open.c:1402 [inline]
 __se_sys_creat fs/open.c:1396 [inline]
 __x64_sys_creat+0x11f/0x160 fs/open.c:1396
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb8d108c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb8d1dee168 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fb8d11ac120 RCX: 00007fb8d108c0c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180
RBP: 00007fb8d10e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcb37f07cf R14: 00007fb8d1dee300 R15: 0000000000022000
 </TASK>
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/23 14:58 upstream 2475bf0250de 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: null-ptr-deref Write in udf_bread
* Struck through repros no longer work on HEAD.