[PATCH 3/7] crypto: hisilicon/hpre - return -EOVERFLOW for small ECDH output buffer

[Weili Qian]

hpre_ecdh_msg_request_set() returns -EINVAL when the output buffer
is too small, after setting req->dst_len to the required size.
-EINVAL is misleading because the caller can retry with a larger
buffer. Return -EOVERFLOW as other kpp implementations do.

Fixes: 05e7b906aa7c ("crypto: hisilicon/hpre - add 'ECDH' algorithm")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Weili Qian <qianweili@xxxxxxxxxx>
---
 drivers/crypto/hisilicon/hpre/hpre_crypto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/hisilicon/hpre/hpre_crypto.c b/drivers/crypto/hisilicon/hpre/hpre_crypto.c
index 8551d6ccb78d..6dea9ce5bae2 100644
--- a/drivers/crypto/hisilicon/hpre/hpre_crypto.c
+++ b/drivers/crypto/hisilicon/hpre/hpre_crypto.c
@@ -1450,7 +1450,7 @@ static int hpre_ecdh_msg_request_set(struct hpre_ctx *ctx,
 
 	if (req->dst_len < ctx->key_sz << 1) {
 		req->dst_len = ctx->key_sz << 1;
-		return -EINVAL;
+		return -EOVERFLOW;
 	}
 
 	tmp = kpp_request_ctx(req);
-- 
2.43.0