[PATCH] crypto: ecrdsa - fix unknown OID check in ecrdsa_param_curve

[Thorsten Blum]

The ->curve_oid check in ecrdsa_param_curve() rejects the valid enum
value 0 (OID_id_dsa_with_sha1), but look_up_OID() returns OID__NR on
lookup failure. Compare ->curve_oid with OID__NR instead to ensure that
only unknown OIDs return -EINVAL.

Fixes: 0d7a78643f69 ("crypto: ecrdsa - add EC-RDSA (GOST 34.10) algorithm")
Signed-off-by: Thorsten Blum <thorsten.blum@xxxxxxxxx>
---
 crypto/ecrdsa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/ecrdsa.c b/crypto/ecrdsa.c
index 2c0602f0cd40..0cd7eb367604 100644
--- a/crypto/ecrdsa.c
+++ b/crypto/ecrdsa.c
@@ -145,7 +145,7 @@ int ecrdsa_param_curve(void *context, size_t hdrlen, unsigned char tag,
 	struct ecrdsa_ctx *ctx = context;
 
 	ctx->curve_oid = look_up_OID(value, vlen);
-	if (!ctx->curve_oid)
+	if (ctx->curve_oid == OID__NR)
 		return -EINVAL;
 	ctx->curve = get_curve_by_oid(ctx->curve_oid);
 	return 0;