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Commit 3cbc5f6e authored by Herbert Xu's avatar Herbert Xu Committed by Greg Kroah-Hartman
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crypto: hash - Fix page length clamping in hash walk 



commit 13f4bb78cf6a312bbdec367ba3da044b09bf0e29 upstream.

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.

Reported-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6f151942

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)