lkml.org 
[lkml]   [2014]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] bridge: fix smatch warning / potential null pointer dereference
Date

"New smatch warnings:
net/bridge/br_multicast.c:1368 br_ip6_multicast_query() error:
we previously assumed 'group' could be null (see line 1349)"

In the rare (sort of broken) case of a query having a Maximum
Response Delay of zero, we could create a potential null pointer
dereference.

Fixing this by skipping the multicast specific MLD Query parsing again
if no multicast group address is available.

Introduced by dc4eb53a996a78bfb8ea07b47423ff5a3aadc362
("bridge: adhere to querier election mechanism specified by RFCs")

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Linus Lüssing <linus.luessing@web.de>
---
net/bridge/br_multicast.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index cd3cf39..876e5fb 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1373,6 +1373,8 @@ static int br_ip6_multicast_query(struct net_bridge *br,
br_multicast_query_received(br, port, &br->ip6_other_query,
&saddr, max_delay);
goto out;
+ } else if (!group) {
+ goto out;
}

mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
--
1.7.10.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2014-06-12 02:01    [W:2.492 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site