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ipv6: fix possible crashes in ip6_cork_release() 

commit 0178b695fd ("ipv6: Copy cork options in ip6_append_data")
added some code duplication and bad error recovery, leading to potential
crash in ip6_cork_release() as kfree() could be called with garbage.

use kzalloc() to make sure this wont happen.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Neal Cardwell <ncardwell@google.com>
This commit is contained in:
Eric Dumazet 2013-05-17 04:53:13 +00:00 committed by David S. Miller
parent 014be2c8ea
commit 284041ef21
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/ip6_output.c
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@ -1147,7 +1147,7 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
if (WARN_ON(np->cork.opt)) if (WARN_ON(np->cork.opt))
return -EINVAL; return -EINVAL;
np->cork.opt = kmalloc(opt->tot_len, sk->sk_allocation); np->cork.opt = kzalloc(opt->tot_len, sk->sk_allocation);
if (unlikely(np->cork.opt == NULL)) if (unlikely(np->cork.opt == NULL))
return -ENOBUFS; return -ENOBUFS;