Patch "crypto: hash - Fix page length clamping in hash walk" has been added to the 4.4-stable tree

Patch "crypto: hash - Fix page length clamping in hash walk" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    crypto: hash - Fix page length clamping in hash walk

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     crypto-hash-fix-page-length-clamping-in-hash-walk.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 13f4bb78cf6a312bbdec367ba3da044b09bf0e29 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Wed, 4 May 2016 17:52:56 +0800
Subject: crypto: hash - Fix page length clamping in hash walk

From: Herbert Xu <herbert@gondor.apana.org.au>

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>

---
 crypto/ahash.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -69,8 +69,9 @@ static int hash_walk_new_entry(struct cr
 	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)


Patches currently in stable-queue which might be from herbert@gondor.apana.org.au are

queue-4.4/crypto-testmgr-use-kmalloc-memory-for-rsa-input.patch
queue-4.4/crypto-qat-fix-invalid-pf2vf_resp_wq-logic.patch
queue-4.4/crypto-hash-fix-page-length-clamping-in-hash-walk.patch