Commit 13f4bb78 authored May 04, 2016 by Herbert Xu

crypto: hash - Fix page length clamping in hash walk



The crypto hash walk code is broken when supplied with an offset
greater than or equal to PAGE_SIZE.  This patch fixes it by adjusting
walk->pg and walk->offset when this happens.

Cc: <stable@vger.kernel.org>
Reported-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

parent 6dc5df71

crypto/ahash.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -69,8 +69,9 @@ static int hash_walk_new_entry(struct crypto_hash_walk *walk)
		struct scatterlist *sg;

		sg = walk->sg;
		walk->pg = sg_page(sg);
		walk->offset = sg->offset;
		walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
		walk->offset = offset_in_page(walk->offset);
		walk->entrylen = sg->length;

		if (walk->entrylen > walk->total)