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authorEric Dumazet <edumazet@google.com>2015-07-06 17:13:26 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-10-01 11:36:19 +0200
commit6133a5c1e5a5a001bff75977653a800fb5c13735 (patch)
treeb5e7cdd2c269ed49505032b879631ecbc110f521 /net/core
parent1742bfe8f498dc13a1de8b2b452bd1ec3aac0544 (diff)
net: graceful exit from netif_alloc_netdev_queues()
[ Upstream commit d339727c2b1a10f25e6636670ab6e1841170e328 ] 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/dev.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 1b9e700c85b6..bfb56c086121 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5951,7 +5951,8 @@ 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) {