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net: Fix usage of pskb_trim_rcsum

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[ Upstream commit 6c57f04580 ]

In certain cases, pskb_trim_rcsum() may change skb pointers.
Reinitialize header pointers afterwards to avoid potential
use-after-frees. Add a note in the documentation of
pskb_trim_rcsum(). Found by KASAN.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ross Lagerwall
2019-01-17 15:34:38 +00:00
committed by Greg Kroah-Hartman
parent 0ae4bffc96
commit 04663e84f0
5 changed files with 5 additions and 0 deletions
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include/linux/skbuff.h
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@@ -2962,6 +2962,7 @@ int pskb_trim_rcsum_slow(struct sk_buff *skb, unsigned int len);
*
* This is exactly the same as pskb_trim except that it ensures the
* checksum of received packets are still valid after the operation.
* It can change skb pointers.
*/
static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len)