linux-kernel - [PATCH 3.16 050/129] crypto: ahash - fix another early termination in hash walk

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Date:   Sun, 07 Jul 2019 17:54:17 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Eric Biggers" <ebiggers@...gle.com>,
        "Herbert Xu" <herbert@...dor.apana.org.au>
Subject: [PATCH 3.16 050/129] crypto: ahash - fix another early
 termination in hash walk

3.16.70-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Biggers <ebiggers@...gle.com>

commit 77568e535af7c4f97eaef1e555bf0af83772456c upstream.

Hash algorithms with an alignmask set, e.g. "xcbc(aes-aesni)" and
"michael_mic", fail the improved hash tests because they sometimes
produce the wrong digest.  The bug is that in the case where a
scatterlist element crosses pages, not all the data is actually hashed
because the scatterlist walk terminates too early.  This happens because
the 'nbytes' variable in crypto_hash_walk_done() is assigned the number
of bytes remaining in the page, then later interpreted as the number of
bytes remaining in the scatterlist element.  Fix it.

Fixes: 900a081f6912 ("crypto: ahash - Fix early termination in hash walk")
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 crypto/ahash.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -84,17 +84,17 @@ static int hash_walk_new_entry(struct cr
 int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
 {
 	unsigned int alignmask = walk->alignmask;
-	unsigned int nbytes = walk->entrylen;
 
 	walk->data -= walk->offset;
 
-	if (nbytes && walk->offset & alignmask && !err) {
-		walk->offset = ALIGN(walk->offset, alignmask + 1);
-		nbytes = min(nbytes,
-			     ((unsigned int)(PAGE_SIZE)) - walk->offset);
-		walk->entrylen -= nbytes;
+	if (walk->entrylen && (walk->offset & alignmask) && !err) {
+		unsigned int nbytes;
 
+		walk->offset = ALIGN(walk->offset, alignmask + 1);
+		nbytes = min(walk->entrylen,
+			     (unsigned int)(PAGE_SIZE - walk->offset));
 		if (nbytes) {
+			walk->entrylen -= nbytes;
 			walk->data += walk->offset;
 			return nbytes;
 		}
@@ -114,7 +114,7 @@ int crypto_hash_walk_done(struct crypto_
 	if (err)
 		return err;
 
-	if (nbytes) {
+	if (walk->entrylen) {
 		walk->offset = 0;
 		walk->pg++;
 		return hash_walk_next(walk);