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authorPatrick McHardy <kaber@trash.net>2010-03-17 09:04:14 +0300
committerDavid S. Miller <davem@davemloft.net>2010-03-20 08:47:22 +0300
commita50436f2cd6e85794f7e1aad795ca8302177b896 (patch)
tree522ac0b3ac330fb53d4ee9147f7565b27b482085 /net/ipv4/ipmr.c
parentea93fd9456ad32cd85b2d7914b58c6313cc40c9e (diff)
downloadlinux-a50436f2cd6e85794f7e1aad795ca8302177b896.tar.xz
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>
Diffstat (limited to 'net/ipv4/ipmr.c')
-rw-r--r--net/ipv4/ipmr.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 8582e12e4a62..0b9d03c54dc3 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -802,6 +802,9 @@ static int ipmr_mfc_add(struct net *net, struct mfcctl *mfc, int mrtsock)
int line;
struct mfc_cache *uc, *c, **cp;
+ if (mfc->mfcc_parent >= MAXVIFS)
+ return -ENFILE;
+
line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
for (cp = &net->ipv4.mfc_cache_array[line];