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authorShan Wei <davidshan@tencent.com>2012-12-04 19:49:15 +0100
committerDavid S. Miller <davem@davemloft.net>2012-12-05 22:01:28 +0100
commitce46cc64d47a8afaf13c300b09a7f9c29f4979b6 (patch)
tree2fcaf39d15b41ee1f92f14eb8035f82eb80a5364 /sound
parentnet/phy: Add interrupt support for dp83640 phy. (diff)
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net: neighbour: prohibit negative value for unres_qlen_bytes parameter
unres_qlen_bytes and unres_qlen are int type. But multiple relation(unres_qlen_bytes = unres_qlen * SKB_TRUESIZE(ETH_FRAME_LEN)) will cause type overflow when seting unres_qlen. e.g. $ echo 1027506 > /proc/sys/net/ipv4/neigh/eth1/unres_qlen $ cat /proc/sys/net/ipv4/neigh/eth1/unres_qlen 1182657265 $ cat /proc/sys/net/ipv4/neigh/eth1/unres_qlen_bytes -2147479756 The gutted value is not that we setting。 But user/administrator don't know this is caused by int type overflow. what's more, it is meaningless and even dangerous that unres_qlen_bytes is set with negative number. Because, for unresolved neighbour address, kernel will cache packets without limit in __neigh_event_send()(e.g. (u32)-1 = 2GB). Signed-off-by: Shan Wei <davidshan@tencent.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'sound')
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