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| author | Eric Dumazet <edumazet@google.com> | 2015-07-06 18:13:26 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-07-09 01:46:17 +0300 |
| commit | d339727c2b1a10f25e6636670ab6e1841170e328 (patch) | |
| tree | 94db136cbede171936df076cfc34dfe351a17265 /net | |
| parent | 142b942a75cb10ede1b42bf85368d41449ab4e3b (diff) | |
| download | linux-d339727c2b1a10f25e6636670ab6e1841170e328.tar.xz | |
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: 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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dev.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 6778a9999d52..0ad626214332 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -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) { |