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caif: Do not dereference NULL in chnl_recv_cb() 

In net/caif/chnl_net.c::chnl_recv_cb() we call skb_header_pointer()
which may return NULL, but we do not check for a NULL pointer before
dereferencing it.
This patch adds such a NULL check and properly free's allocated memory
and return an error (-EINVAL) on failure - much better than crashing..

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Acked-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Juhl 2012-08-17 10:33:12 +00:00 committed by David S. Miller
parent 6c71bec66a
commit d92c7f8aab
1 changed files with 4 additions and 0 deletions
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4
net/caif/chnl_net.c
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@ -94,6 +94,10 @@ static int chnl_recv_cb(struct cflayer *layr, struct cfpkt *pkt)
/* check the version of IP */
ip_version = skb_header_pointer(skb, 0, 1, &buf);
if (!ip_version) {
kfree_skb(skb);
return -EINVAL;
}
switch (*ip_version >> 4) {
case 4: