crypto: algif_hash - wait for crypto_ahash_init() to complete

hash_sendmsg/sendpage() need to wait for the completion
of crypto_ahash_init() otherwise it can cause panic.

Cc: stable@vger.kernel.org
Signed-off-by: Rui Wang <rui.y.wang@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 3 insertions, 1 deletions

diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 608a7562839d..68a5ceaa04c8 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -54,7 +54,8 @@ static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
 
         lock_sock(sk);
         if (!ctx->more) {
-                err = crypto_ahash_init(&ctx->req);
+                err = af_alg_wait_for_completion(crypto_ahash_init(&ctx->req),
+                                                &ctx->completion);
                 if (err)
                         goto unlock;
         }
@@ -125,6 +126,7 @@ static ssize_t hash_sendpage(struct socket *sock, struct page *page,
         } else {
                 if (!ctx->more) {
                         err = crypto_ahash_init(&ctx->req);
+                        err = af_alg_wait_for_completion(err, &ctx->completion);
                         if (err)
                                 goto unlock;
                 }