[PATCH 3.19.y-ckt 024/196] crypto: algif_hash - wait for crypto_ahash_init() to complete

From: Kamal Mostafa
Date: Tue Mar 08 2016 - 20:18:43 EST


3.19.8-ckt16 -stable review patch. If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: "Wang, Rui Y" <rui.y.wang@xxxxxxxxx>

commit fe09786178f9df713a4b2dd6b93c0a722346bf5e upstream.

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

Signed-off-by: Rui Wang <rui.y.wang@xxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
crypto/algif_hash.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 647551b..43a595e 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -51,7 +51,8 @@ static int hash_sendmsg(struct kiocb *unused, struct socket *sock,

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;
}
@@ -131,6 +132,7 @@ 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;
}
--
2.7.0