[Bridge] [patch] netfilter: prevent harmless integer overflow

[Dan Carpenter]

This overflow is harmless because a few lines later we check:

        if (num_counters != t->private->nentries) {

But it still upsets the static checkers.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 3d110c4..141350e 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1278,6 +1278,8 @@ static int do_update_counters(struct net *net, const char 
*name,
 
        if (num_counters == 0)
                return -EINVAL;
+       if (num_counters > INT_MAX / sizeof(*tmp))
+               return -ENOMEM;
 
        tmp = vmalloc(num_counters * sizeof(*tmp));
        if (!tmp)