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[NETLABEL]: Fix NULL deref in netlbl_unlabel_staticlist_gen() if ifindex not found

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dev_get_by_index() may return NULL if nothing is found. In 
net/netlabel/netlabel_unlabeled.c::netlbl_unlabel_staticlist_gen() the 
function is called, but the return value is never checked. If it returns 
NULL then we'll deref a NULL pointer on the very next line.
I checked the callers, and I don't think this can actually happen today, 
but code changes over time and in the future it might happen and it does 
no harm to be defensive and check for the failure, so that if/when it 
happens we'll fail gracefully instead of crashing.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Acked-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Juhl 2008-04-17 23:22:54 -07:00 committed by David S. Miller
parent f5ba2d3217
commit 794eb6bf20
1 changed files with 4 additions and 0 deletions
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4
net/netlabel/netlabel_unlabeled.c
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@ -1339,6 +1339,10 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
if (iface->ifindex > 0) {
dev = dev_get_by_index(&init_net, iface->ifindex);
if (!dev) {
ret_val = -ENODEV;
goto list_cb_failure;
}
ret_val = nla_put_string(cb_arg->skb,
NLBL_UNLABEL_A_IFACE, dev->name);
dev_put(dev);