Commit d339727c authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
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net: graceful exit from netif_alloc_netdev_queues()

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: 60877a32

 ("net: allow large number of tx queues")
Signed-off-by: default avatarEric Dumazet <>
Signed-off-by: default avatarDavid S. Miller <>
parent 142b942a
......@@ -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) {
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