syzbot


WARNING: refcount bug in chrdev_open
Status: fixed on 2020/02/18 14:31
Reported-by: syzbot+1c85a21f1c6bc88eb388@syzkaller.appspotmail.com
Fix commit: 68faa679b8be chardev: Avoid potential use-after-free in 'chrdev_open()'
First crash: 841d, last: 735d

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: WARNING in kobject_get (log)
Repro: C syz .config

Fix bisection: fixed by (bisect log) :
commit 68faa679b8be1a74e6663c21c3a9d25d32f1c079
Author: Will Deacon <will@kernel.org>
Date: Thu Dec 19 12:02:03 2019 +0000

  chardev: Avoid potential use-after-free in 'chrdev_open()'


Sample crash report:

Crashes (15):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2019/11/30 20:42 upstream 81b6b96475ac 3a75be00 .config log report syz C
ci-upstream-kasan-gce-smack-root 2019/09/23 16:10 upstream 619e17cf75dd 1e9788a0 .config log report syz C
ci-upstream-kasan-gce-smack-root 2019/08/16 20:04 upstream a69e90512d9d 8fd428a1 .config log report syz C
ci-upstream-kasan-gce-smack-root 2019/09/14 06:44 upstream a7f89616b737 32d59357 .config log report syz
ci-upstream-kasan-gce-smack-root 2019/11/18 05:00 upstream cbb104f91dfe d5696d51 .config log report
ci-upstream-kasan-gce-smack-root 2019/10/24 16:46 upstream f116b96685a0 d01bb02a .config log report
ci-upstream-kasan-gce-smack-root 2019/10/04 13:27 upstream cc3a7bfe62b9 b2f369e5 .config log report
ci-upstream-kasan-gce-smack-root 2019/09/14 04:16 upstream a7f89616b737 32d59357 .config log report
ci-upstream-kasan-gce-smack-root 2019/09/12 09:40 upstream 3120b9a6a3f7 f4e53c10 .config log report
ci-upstream-kasan-gce-smack-root 2019/09/10 02:41 upstream 56037cadf604 a60cb4cd .config log report
ci-upstream-kasan-gce-smack-root 2019/09/09 22:46 upstream 56037cadf604 a60cb4cd .config log report
ci-upstream-kasan-gce-smack-root 2019/08/30 05:37 upstream 6525771f58cb fd37b39e .config log report
ci-upstream-kasan-gce-smack-root 2019/08/25 08:22 upstream 361469211f87 d21c5d9d .config log report
ci-upstream-kasan-gce-smack-root 2019/08/23 17:25 upstream e3fb13b7e47c 78ded196 .config log report
ci-upstream-kasan-gce-smack-root 2019/08/16 18:05 upstream a69e90512d9d 8fd428a1 .config log report