From: Herbert Xu Date: Tue, 12 Jul 2016 05:17:57 +0000 (+0800) Subject: crypto: scatterwalk - Fix test in scatterwalk_done X-Git-Tag: firefly_0821_release~176^2~4^2~34^2~10 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=08bb036c9d82ec70fd88c7e08345373a97f98637;p=firefly-linux-kernel-4.4.55.git 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 Signed-off-by: Greg Kroah-Hartman --- 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);