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

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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: 3b780bed31 ("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>
This commit is contained in:
Cong Wang 2018-12-29 13:56:37 -08:00 committed by David S. Miller
parent c433570458
commit d5c7c745f2
1 changed files with 2 additions and 0 deletions
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2
drivers/net/wan/x25_asy.c
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@ -485,8 +485,10 @@ static int x25_asy_open(struct net_device *dev)
/* Cleanup */
kfree(sl->xbuff);
sl->xbuff = NULL;
noxbuff:
kfree(sl->rbuff);
sl->rbuff = NULL;
norbuff:
return -ENOMEM;
}