[HIFN]: Handle ablkcipher_walk errors

    
ablkcipher_walk may return a negative error value, handle this properly
instead of treating it as a huge number of scatter-gather elements.
    
Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/crypto/hifn_795x.c b/drivers/crypto/hifn_795x.c
index cce6e6f1baa5..4e89cd8f664f 100644
--- a/drivers/crypto/hifn_795x.c
+++ b/drivers/crypto/hifn_795x.c
@@ -1602,7 +1602,10 @@ static int hifn_setup_session(struct ablkcipher_request *req)
         idx = 0;
 
         sg_num = ablkcipher_walk(req, &ctx->walk);
-
+        if (sg_num < 0) {
+                err = sg_num;
+                goto err_out_exit;
+        }
         atomic_set(&ctx->sg_num, sg_num);
 
         spin_lock_irqsave(&dev->lock, flags);