crypto: algif_skcipher - Load TX SG list after waiting

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

Cc: stable@vger.kernel.org
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Dmitry Vyukov <dvyukov@google.com>

diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index dfff8b0b56dfae05a8a0438655da24070044c54b..df86fb47c3ae814f8243279d33698bc336425530 100644 (file)
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -647,13 +647,6 @@ static int skcipher_recvmsg_sync(struct socket *sock, struct msghdr *msg,
 
        lock_sock(sk);
        while (msg_data_left(msg)) {
-               sgl = list_first_entry(&ctx->tsgl,
-                                      struct skcipher_sg_list, list);
-               sg = sgl->sg;
-
-               while (!sg->length)
-                       sg++;
-
                if (!ctx->used) {
                        err = skcipher_wait_for_data(sk, flags);
                        if (err)
@@ -674,6 +667,13 @@ static int skcipher_recvmsg_sync(struct socket *sock, struct msghdr *msg,
                if (!used)
                        goto free;
 
+               sgl = list_first_entry(&ctx->tsgl,
+                                      struct skcipher_sg_list, list);
+               sg = sgl->sg;
+
+               while (!sg->length)
+                       sg++;
+
                skcipher_request_set_crypt(&ctx->req, sg, ctx->rsgl.sg, used,
                                           ctx->iv);