linux-kernel - [PATCH 3.2 82/87] crypto: algif_skcipher

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Message-ID: <lsq.1454975631.503794136@decadent.org.uk>
Date:	Mon, 08 Feb 2016 23:53:51 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Herbert Xu" <herbert@...dor.apana.org.au>,
	"Dmitry Vyukov" <dvyukov@...gle.com>
Subject: [PATCH 3.2 82/87] crypto: algif_skcipher - Load TX SG list after
 waiting

3.2.77-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Herbert Xu <herbert@...dor.apana.org.au>

commit 4f0414e54e4d1893c6f08260693f8ef84c929293 upstream.

We need to load the TX SG list in sendmsg(2) after waiting for
incoming data, not before.

Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Tested-by: Dmitry Vyukov <dvyukov@...gle.com>
[bwh: Backported to 3.2: adjust context, indentation]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 crypto/algif_skcipher.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -446,13 +446,6 @@ static int skcipher_recvmsg(struct kiocb
 		char __user *from = iov->iov_base;
 
 		while (seglen) {
-			sgl = list_first_entry(&ctx->tsgl,
-					       struct skcipher_sg_list, list);
-			sg = sgl->sg;
-
-			while (!sg->length)
-				sg++;
-
 			used = ctx->used;
 			if (!used) {
 				err = skcipher_wait_for_data(sk, flags);
@@ -474,6 +467,13 @@ static int skcipher_recvmsg(struct kiocb
 			if (!used)
 				goto free;
 
+			sgl = list_first_entry(&ctx->tsgl,
+					       struct skcipher_sg_list, list);
+			sg = sgl->sg;
+
+			while (!sg->length)
+				sg++;
+
 			ablkcipher_request_set_crypt(&ctx->req, sg,
 						     ctx->rsgl.sg, used,
 						     ctx->iv);