From: Herbert Xu Date: Tue, 19 Jan 2016 13:23:57 +0000 (+0800) Subject: crypto: algif_skcipher - sendmsg SG marking is off by one X-Git-Tag: drm-fsl-dcu-for-next~1764^2 X-Git-Url: http://git.agner.ch/gitweb/?p=linux-drm-fsl-dcu.git;a=commitdiff_plain;h=202736d99b7f29279db9da61587f11a08a04a9c6 crypto: algif_skcipher - sendmsg SG marking is off by one We mark the end of the SG list in sendmsg and sendpage and unmark it on the next send call. Unfortunately the unmarking in sendmsg is off-by-one, leading to an SG list that is too short. Fixes: 0f477b655a52 ("crypto: algif - Mark sgl end at the end of data") Cc: stable@vger.kernel.org Signed-off-by: Herbert Xu --- diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c index df86fb47c3ae..a81c10faf9c4 100644 --- a/crypto/algif_skcipher.c +++ b/crypto/algif_skcipher.c @@ -392,7 +392,8 @@ static int skcipher_sendmsg(struct socket *sock, struct msghdr *msg, sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list); sg = sgl->sg; - sg_unmark_end(sg + sgl->cur); + if (sgl->cur) + sg_unmark_end(sg + sgl->cur - 1); do { i = sgl->cur; plen = min_t(size_t, len, PAGE_SIZE);