Re: [Patch net] net/wan: fix a double free in x25_asy_open_tty()
From: David Miller <davem@davemloft.net>
Date: 2018-12-31 04:23:36
From: Cong Wang <redacted> Date: Sat, 29 Dec 2018 13:56:37 -0800
When x25_asy_open() fails, it already cleans up by itself,
so its caller doesn't need to free the memory again.
It seems we still have to call x25_asy_free() to clear the SLF_INUSE
bit, so just set these pointers to NULL after kfree().
Reported-and-tested-by: syzbot+5e5e969e525129229052@syzkaller.appspotmail.com
Fixes: 3b780bed3138 ("x25_asy: Free x25_asy on x25_asy_open() failure.")
Signed-off-by: Cong Wang <redacted>Applied and queued up for -stable, thanks Cong.