Commit 13f4bb78 authored by Herbert Xu's avatar 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: default avatarSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 6dc5df71
......@@ -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)
......
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