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net: graceful exit from netif_alloc_netdev_queues()

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User space can crash kernel with

ip link add ifb10 numtxqueues 100000 type ifb

We must replace a BUG_ON() by proper test and return -EINVAL for
crazy values.

Fixes: 60877a32bce00 ("net: allow large number of tx queues")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-07-06 17:13:26 +02:00 committed by David S. Miller
parent 142b942a75
commit d339727c2b
1 changed files with 2 additions and 1 deletions
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3
net/core/dev.c
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@ -6409,7 +6409,8 @@ static int netif_alloc_netdev_queues(struct net_device *dev)
struct netdev_queue *tx;
size_t sz = count * sizeof(*tx);
BUG_ON(count < 1 || count > 0xffff);
if (count < 1 || count > 0xffff)
return -EINVAL;
tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
if (!tx) {