| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.7 34/41] crypto: scatterwalk - Fix test in scatterwalk_done | Date | Sun, 14 Aug 2016 22:39:00 +0200 |
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4.7-stable review patch. If anyone has any objections, please let me know.
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From: Herbert Xu <herbert@gondor.apana.org.au>
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>
--- crypto/scatterwalk.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/crypto/scatterwalk.c +++ b/crypto/scatterwalk.c @@ -72,7 +72,8 @@ static void scatterwalk_pagedone(struct 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);
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