From: Eric Dumazet <edumazet@google.com>
Date: Wed, 9 Sep 2020 08:27:40 +0000 (-0700)
Subject: net: add __must_check to skb_put_padto()
X-Git-Tag: v5.4.68~3
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=7f23aa7cabdd017e169ee18681a42182d0ae7259;p=users%2Fdwmw2%2Flinux.git

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 955e1370f033d..a62889c8bed7a 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3185,8 +3185,9 @@ 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;
 
@@ -3209,7 +3210,7 @@ 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);
 }