diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2016-05-04 17:52:56 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-18 17:06:45 -0700 |
| commit | 3cbc5f6ed2722a65b75de22fe2206471f093b6c3 (patch) | |
| tree | c94944d994a4635fdd000f65f29185bb57b39ada | |
| parent | 6f1519425705094323912e55d8d6e174775b9caf (diff) | |
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: 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>
| -rw-r--r-- | crypto/ahash.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/ahash.c b/crypto/ahash.c index d19b52324cf5..dac1c24e9c3e 100644 --- a/crypto/ahash.c +++ b/crypto/ahash.c @@ -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) |