net: add __must_check to skb_put_padto()

[ Upstream commit 4a009cb04aeca0de60b73f37b102573354214b52 ]

skb_put_padto() and __skb_put_padto() callers
must check return values or risk use-after-free.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index a9a764a17c289fa1bc14930663c1f2d86fd7bada..71c77463d34322fe3dca73aa9f79e8b33952ecc2 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2999,8 +2999,9 @@ static inline int skb_padto(struct sk_buff *skb, unsigned int len)
  *     is untouched. Otherwise it is extended. Returns zero on
  *     success. The skb is freed on error if @free_on_error is true.
  */
-static inline int __skb_put_padto(struct sk_buff *skb, unsigned int len,
-                                 bool free_on_error)
+static inline int __must_check __skb_put_padto(struct sk_buff *skb,
+                                              unsigned int len,
+                                              bool free_on_error)
 {
        unsigned int size = skb->len;
 
@@ -3023,7 +3024,7 @@ static inline int __skb_put_padto(struct sk_buff *skb, unsigned int len,
  *     is untouched. Otherwise it is extended. Returns zero on
  *     success. The skb is freed on error.
  */
-static inline int skb_put_padto(struct sk_buff *skb, unsigned int len)
+static inline int __must_check skb_put_padto(struct sk_buff *skb, unsigned int len)
 {
        return __skb_put_padto(skb, len, true);
 }