tree 522ac0b3ac330fb53d4ee9147f7565b27b482085
parent ea93fd9456ad32cd85b2d7914b58c6313cc40c9e
author Patrick McHardy <kaber@trash.net> 1268805854 +0000
committer David S. Miller <davem@davemloft.net> 1269064042 -0700

net: ipmr/ip6mr: fix potential out-of-bounds vif_table access

mfc_parent of cache entries is used to index into the vif_table and is
initialised from mfcctl->mfcc_parent. This can take values of to 2^16-1,
while the vif_table has only MAXVIFS (32) entries. The same problem
affects ip6mr.

Refuse invalid values to fix a potential out-of-bounds access. Unlike
the other validity checks, this is checked in ipmr_mfc_add() instead of
the setsockopt handler since its unused in the delete path and might be
uninitialized.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>