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| author | Patrick McHardy <kaber@trash.net> | 2010-03-17 06:04:14 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-03-19 22:47:22 -0700 |
| commit | a50436f2cd6e85794f7e1aad795ca8302177b896 (patch) | |
| tree | 522ac0b3ac330fb53d4ee9147f7565b27b482085 /net/ipv4/ipmr.c | |
| parent | ea93fd9456ad32cd85b2d7914b58c6313cc40c9e (diff) | |
| download | lwn-a50436f2cd6e85794f7e1aad795ca8302177b896.tar.gz lwn-a50436f2cd6e85794f7e1aad795ca8302177b896.zip | |
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.c | 3 |
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]; |