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authorHerbert Xu <herbert@gondor.apana.org.au>2016-07-12 13:17:57 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-08-16 09:30:50 +0200
commit08bb036c9d82ec70fd88c7e08345373a97f98637 (patch)
treed2824567534c3593c3b16cb7151fb169efe2b63d /crypto
parent148fbb966837725e6ff8f151ae6053521d04882c (diff)
crypto: scatterwalk - Fix test in scatterwalk_done
commit 5f070e81bee35f1b7bd1477bb223a873ff657803 upstream. When there is more data to be processed, the current test in scatterwalk_done may prevent us from calling pagedone even when we should. In particular, if we're on an SG entry spanning multiple pages where the last page is not a full page, we will incorrectly skip calling pagedone on the second last page. This patch fixes this by adding a separate test for whether we've reached the end of a page. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/scatterwalk.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c
index ea5815c5e128..bc769c448d4a 100644
--- a/crypto/scatterwalk.c
+++ b/crypto/scatterwalk.c
@@ -72,7 +72,8 @@ static void scatterwalk_pagedone(struct scatter_walk *walk, int out,
void scatterwalk_done(struct scatter_walk *walk, int out, int more)
{
- if (!(scatterwalk_pagelen(walk) & (PAGE_SIZE - 1)) || !more)
+ if (!more || walk->offset >= walk->sg->offset + walk->sg->length ||
+ !(walk->offset & (PAGE_SIZE - 1)))
scatterwalk_pagedone(walk, out, more);
}
EXPORT_SYMBOL_GPL(scatterwalk_done);