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net: add __must_check to skb_put_padto()

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[ 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>
This commit is contained in:
Eric Dumazet 2020-09-09 01:27:40 -07:00 committed by Greg Kroah-Hartman
parent 771443a2ff
commit f424617e01
1 changed files with 4 additions and 3 deletions
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7
include/linux/skbuff.h
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@ -3014,8 +3014,9 @@ 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;
@ -3038,7 +3039,7 @@ 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);
}