tree 7fc6a09d7ea3da996a921d319f2d7ae22a321039
parent c433570458e49bccea5c551df628d058b3526289
author Cong Wang <xiyou.wangcong@gmail.com> 1546120597 -0800
committer David S. Miller <davem@davemloft.net> 1546230168 -0800

net/wan: fix a double free in x25_asy_open_tty()

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 <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>