KASAN: null-ptr-deref Read in init_emulate

KASAN: null-ptr-deref Read in init_emulate_ctxt

Status: auto-closed as invalid on 2020/08/06 13:51
Subsystems: kvm
[Documentation on labels]
Reported-by: syzbot+4a946e65aa25edfdb55f@syzkaller.appspotmail.com
First crash: 1472d, last: 1472d

▶ ▼ Discussions (1)

Title	Replies (including bot)	Last reply
KASAN: null-ptr-deref Read in init_emulate_ctxt	0 (1)	2020/04/12 14:11

Sample crash report:

==================================================================
BUG: KASAN: null-ptr-deref in init_emulate_ctxt+0x497/0x4a0 arch/x86/kvm/x86.c:6424
Read of size 8 at addr 0000000000000005 by task syz-executor.2/9707

CPU: 1 PID: 9707 Comm: syz-executor.2 Not tainted 5.6.0-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+0x188/0x20d lib/dump_stack.c:118
 __kasan_report.cold+0x5/0x4d mm/kasan/report.c:515
 kasan_report+0x33/0x50 mm/kasan/common.c:625
 init_emulate_ctxt+0x497/0x4a0 arch/x86/kvm/x86.c:6424
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 9707 Comm: syz-executor.2 Tainted: G    B             5.6.0-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+0x188/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 end_report+0x4d/0x53 mm/kasan/report.c:103
 __kasan_report.cold+0xd/0x4d mm/kasan/report.c:518
 kasan_report+0x33/0x50 mm/kasan/common.c:625
 init_emulate_ctxt+0x497/0x4a0 arch/x86/kvm/x86.c:6424
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2020/04/08 13:50	upstream	f5e94d10e4c4	db9bcd4b	.config	console log	report					ci-upstream-kasan-gce

* ~~Struck through~~ repros no longer work on HEAD.