[PATCH 4.4 10/21] net: sched: Fix a possible null-pointer dereference in dequeue_func()

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>

[ Upstream commit 051c7b39be4a91f6b7d8c4548444e4b850f1f56c ]

In dequeue_func(), there is an if statement on line 74 to check whether
skb is NULL:
    if (skb)

When skb is NULL, it is used on line 77:
    prefetch(&skb->end);

Thus, a possible null-pointer dereference may occur.

To fix this bug, skb->end is used when skb is not NULL.

This bug is found by a static analysis tool STCheck written by us.

Fixes: 76e3cc126bb2 ("codel: Controlled Delay AQM")
Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>
Reviewed-by: Jiri Pirko <jiri@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/sched/sch_codel.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/sched/sch_codel.c
+++ b/net/sched/sch_codel.c
@@ -68,7 +68,8 @@ static struct sk_buff *dequeue(struct co
 {
 	struct sk_buff *skb = __skb_dequeue(&sch->q);
 
-	prefetch(&skb->end); /* we'll need skb_shinfo() */
+	if (skb)
+		prefetch(&skb->end); /* we'll need skb_shinfo() */
 	return skb;
 }