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crypto: algif_skcipher - sendmsg SG marking is off by one

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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: 0f477b655a ("crypto: algif - Mark sgl end at the end of data")
Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2016-01-19 21:23:57 +08:00
parent fd7f672710
commit 202736d99b
1 changed files with 2 additions and 1 deletions
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3
crypto/algif_skcipher.c
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@ -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);