From: Will Thomas <will.thomas@imgtec.com>
Date: Fri, 5 Aug 2016 13:00:14 +0000 (+0100)
Subject: crypto: img-hash - Fix null pointer exception
X-Git-Tag: v4.9-rc1~53^2~121
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=10badea259fab2ec91a5e6bf1e568a01e4cb5263;p=karo-tx-linux.git

crypto: img-hash - Fix null pointer exception

Sporadic null pointer exceptions came from here. Fix them.

Signed-off-by: Will Thomas <will.thomas@imgtec.com>
Reviewed-by: James Hartley <james.hartley@imgtec.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/drivers/crypto/img-hash.c b/drivers/crypto/img-hash.c
index 68e8aa90fe01..e5c941bdc693 100644
--- a/drivers/crypto/img-hash.c
+++ b/drivers/crypto/img-hash.c
@@ -361,7 +361,7 @@ static void img_hash_dma_task(unsigned long d)
 	size_t nbytes, bleft, wsend, len, tbc;
 	struct scatterlist tsg;
 
-	if (!ctx->sg)
+	if (!hdev->req || !ctx->sg)
 		return;
 
 	addr = sg_virt(ctx->sg);