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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2016-04-18 14:37:10 +0300
committerDavid S. Miller <davem@davemloft.net>2016-04-19 20:09:25 -0400
commit2309236c13feae619572324efd3e910e66ef6bd0 (patch)
treef3d9a2a3469383ce8a93fb1e5fb9f1b487b55dd7 /include/net/cls_cgroup.h
parent851b10d60879539bec8acecb35ed361393399282 (diff)
cls_cgroup: get sk_classid only from full sockets
skb->sk could point to timewait or request socket which has no sk_classid. Detected as "BUG: KASAN: slab-out-of-bounds in cls_cgroup_classify". Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/cls_cgroup.h')
-rw-r--r--include/net/cls_cgroup.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/include/net/cls_cgroup.h b/include/net/cls_cgroup.h
index c0a92e2c286d..74c9693d4941 100644
--- a/include/net/cls_cgroup.h
+++ b/include/net/cls_cgroup.h
@@ -17,6 +17,7 @@
#include <linux/hardirq.h>
#include <linux/rcupdate.h>
#include <net/sock.h>
+#include <net/inet_sock.h>
#ifdef CONFIG_CGROUP_NET_CLASSID
struct cgroup_cls_state {
@@ -63,11 +64,13 @@ static inline u32 task_get_classid(const struct sk_buff *skb)
* softirqs always disables bh.
*/
if (in_serving_softirq()) {
+ struct sock *sk = skb_to_full_sk(skb);
+
/* If there is an sock_cgroup_classid we'll use that. */
- if (!skb->sk)
+ if (!sk || !sk_fullsock(sk))
return 0;
- classid = sock_cgroup_classid(&skb->sk->sk_cgrp_data);
+ classid = sock_cgroup_classid(&sk->sk_cgrp_data);
}
return classid;