Re: KASAN: use-after-free Read in sctp_sock_dump

On Mon, Oct 28, 2019 at 08:32:08AM -0700, syzbot wrote:

Hello,

syzbot found the following crash on:

HEAD commit:    d6d5df1d Linux 5.4-rc5
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17ef5a70e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2bcb64e504d04eff
dashboard link: https://syzkaller.appspot.com/bug?extid=e5b57b8780297657b25b
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16cd8800e00000

The bug was bisected to:

commit 61086f391044fd587af9d70a9b8f6f800dd474ba
Author: Vlad Buslov [off-list ref]
Date:   Fri Aug 2 19:21:56 2019 +0000

    net/mlx5e: Protect encap hash table with mutex

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=135960af600000

This is weird. This mlx5e commit has nothing to do with SCTP diag
dump.

  Marcelo