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netfilter: nfnetlink: check callbacks before using those in nfnetlink_rcv_msg

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nfnetlink_rcv_msg() might call a NULL callback which will cause NULL pointer
dereference.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Tomasz Bursztyka 2012-06-28 02:57:47 +00:00 • committed by Pablo Neira Ayuso
parent be0593c678
commit 59560a38a3
1 changed files with 3 additions and 1 deletions
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4
net/netfilter/nfnetlink.c
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@ -184,9 +184,11 @@ replay:
lockdep_is_held(&nfnl_mutex)) != ss || lockdep_is_held(&nfnl_mutex)) != ss ||
nfnetlink_find_client(type, ss) != nc) nfnetlink_find_client(type, ss) != nc)
err = -EAGAIN; err = -EAGAIN;
else else if (nc->call)
err = nc->call(net->nfnl, skb, nlh, err = nc->call(net->nfnl, skb, nlh,
(const struct nlattr **)cda); (const struct nlattr **)cda);
else
err = -EINVAL;
nfnl_unlock(); nfnl_unlock();
} }
if (err == -EAGAIN) if (err == -EAGAIN)