net: core: Prevent from dereferencing null pointer when releasing SKB

Added NULL check to make __dev_kfree_skb_irq consistent with kfree family of functions. Link: https://bugzilla.kernel.org/show_bug.cgi?id=195289 Signed-off-by: Myungho Jung <[email protected]> Signed-off-by: David S. Miller <[email protected]>
IronBlood · Apr 26, 2017 · 9899886 · 9899886
1 parent 5294b83
commit 9899886
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/net/core/dev.c b/net/core/dev.c
@@ -2450,6 +2450,9 @@ void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
 {
 	unsigned long flags;
 
+	if (unlikely(!skb))
+		return;
+
 	if (likely(atomic_read(&skb->users) == 1)) {
 		smp_rmb();
 		atomic_set(&skb->users, 0);