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crypto: hash - Fix page length clamping in hash walk

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commit 13f4bb78cf 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: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Herbert Xu 2016-05-04 17:52:56 +08:00 committed by Greg Kroah-Hartman
parent 6f15194257
commit 3cbc5f6ed2
1 changed files with 2 additions and 1 deletions
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3
crypto/ahash.c
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@ -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)