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authorFlorian Westphal <fw@strlen.de>2018-03-08 12:54:19 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2018-03-11 21:24:00 +0100
commit932909d9b28d27e807ff8eecb68c7748f6701628 (patch)
treeea671a688a0f64f55fea909041d2cc4de9f2e5db /net/bridge
parent0d3601d2994a4ad9edf0b44f2ea34c68ff494ea5 (diff)
downloadlinux-932909d9b28d27e807ff8eecb68c7748f6701628.tar.bz2
netfilter: ebtables: fix erroneous reject of last rule
The last rule in the blob has next_entry offset that is same as total size. This made "ebtables32 -A OUTPUT -d de:ad:be:ef:01:02" fail on 64 bit kernel. Fixes: b71812168571fa ("netfilter: ebtables: CONFIG_COMPAT: don't trust userland offsets") Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/bridge')
-rw-r--r--net/bridge/netfilter/ebtables.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 254ef9f49567..a94d23b0a9af 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -2119,8 +2119,12 @@ static int size_entry_mwt(struct ebt_entry *entry, const unsigned char *base,
* offsets are relative to beginning of struct ebt_entry (i.e., 0).
*/
for (i = 0; i < 4 ; ++i) {
- if (offsets[i] >= *total)
+ if (offsets[i] > *total)
return -EINVAL;
+
+ if (i < 3 && offsets[i] == *total)
+ return -EINVAL;
+
if (i == 0)
continue;
if (offsets[i-1] > offsets[i])