From 67cb60e4efe7bd9d7a7afb8297f58afe25c28919 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@google.com>
Date: Sun, 14 Apr 2019 16:23:33 -0700
Subject: [PATCH] crypto: shash - fix missed optimization in
shash_ahash_digest()
shash_ahash_digest(), which is the ->digest() method for ahash tfms that
use an shash algorithm, has an optimization where crypto_shash_digest()
is called if the data is in a single page. But an off-by-one error
prevented this path from being taken unless the user happened to provide
extra data in the scatterlist. Fix it.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
crypto/shash.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/crypto/shash.c b/crypto/shash.c
index 15b369c4745f..b85930e9a7a2 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -307,7 +307,7 @@ int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
if (nbytes &&
(sg = req->src, offset = sg->offset,
- nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
+ nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
void *data;
data = kmap_atomic(sg_page(sg));
--
GitLab