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KMSAN: uninit-value in snd_seq_oss_synth_make_info (2)

Status: fixed on 2021/03/10 01:48
Subsystems: sound
[Documentation on labels]
Reported-by: syzbot+e42504ff21cff05a595f@syzkaller.appspotmail.com
Fix commit: 217bfbb8b0bf ALSA: seq: oss: Fix missing error check in snd_seq_oss_synth_make_info()
First crash: 1163d, last: 1163d
Discussions (4)
Title Replies (including bot) Last reply
[PATCH 4.19 00/58] 4.19.171-rc1 review 70 (70) 2021/01/26 23:38
[PATCH 5.10 000/199] 5.10.11-rc1 review 208 (208) 2021/01/26 23:37
[PATCH 5.4 00/86] 5.4.93-rc1 review 89 (89) 2021/01/26 07:03
KMSAN: uninit-value in snd_seq_oss_synth_make_info (2) 0 (1) 2021/01/15 08:47
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in snd_seq_oss_synth_make_info sound 1 1938d 1938d 0/26 auto-closed as invalid on 2019/05/26 08:17

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in strlen lib/string.c:576 [inline]
BUG: KMSAN: uninit-value in strlcpy+0x8c/0x1c0 lib/string.c:143
CPU: 1 PID: 10203 Comm: syz-executor.3 Not tainted 5.10.0-rc4-syzkaller #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+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 strlen lib/string.c:576 [inline]
 strlcpy+0x8c/0x1c0 lib/string.c:143
 snd_seq_oss_synth_make_info+0x381/0x820 sound/core/seq/oss/seq_oss_synth.c:619
 snd_seq_oss_synth_info_user sound/core/seq/oss/seq_oss_ioctl.c:24 [inline]
 snd_seq_oss_ioctl+0x12b4/0x2530 sound/core/seq/oss/seq_oss_ioctl.c:139
 odev_ioctl sound/core/seq/oss/seq_oss.c:180 [inline]
 odev_ioctl_compat+0x247/0x290 sound/core/seq/oss/seq_oss.c:190
 __do_compat_sys_ioctl fs/ioctl.c:842 [inline]
 __se_compat_sys_ioctl+0x53d/0x1100 fs/ioctl.c:793
 __ia32_compat_sys_ioctl+0x4a/0x70 fs/ioctl.c:793
 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x102/0x160 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f8c549
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f55860cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000c08c5114
RDX: 0000000020000080 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Local variable ----minf@snd_seq_oss_synth_make_info created at:
 snd_seq_oss_synth_make_info+0x22a/0x820 sound/core/seq/oss/seq_oss_synth.c:613
 snd_seq_oss_synth_make_info+0x22a/0x820 sound/core/seq/oss/seq_oss_synth.c:613
=====================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/01/10 18:30 https://github.com/google/kmsan.git master 73d62e81b476 2c1f2513 .config console log report info ci-upstream-kmsan-gce-386
* Struck through repros no longer work on HEAD.