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authorHerbert Xu <herbert@gondor.apana.org.au>2016-07-12 13:17:57 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2016-07-18 17:35:49 +0800
commit5f070e81bee35f1b7bd1477bb223a873ff657803 (patch)
tree102ab17bc58b1ea8cdb3b5fed872f7cae19c5a28
parent4140139734459db4dffc50dad7b9e21ed79a8dd9 (diff)
downloadlinux-5f070e81bee35f1b7bd1477bb223a873ff657803.tar.bz2
crypto: scatterwalk - Fix test in scatterwalk_done
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. Cc: stable@vger.kernel.org Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r--crypto/scatterwalk.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c
index e124ce26feed..52aae2974794 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);