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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2016-05-04 17:52:56 +0800 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2016-05-16 16:29:24 +0200 |
| commit | 8eb11b8826791f694797241bf9c8182dd83e7eae (patch) | |
| tree | 80e556a29bcd985ec17addc9a3176e4bce7c852c | |
| parent | 1f649733e3b6779147fdd81e276078d01a54cc6e (diff) | |
| download | lwn-8eb11b8826791f694797241bf9c8182dd83e7eae.tar.gz lwn-8eb11b8826791f694797241bf9c8182dd83e7eae.zip | |
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: Jiri Slaby <jslaby@suse.cz>
| -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 b246858ca032..781a8a73a7ff 100644 --- a/crypto/ahash.c +++ b/crypto/ahash.c @@ -64,8 +64,9 @@ 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) |