[PATCH 6/8] crypto: dh - fix dh_max_size

[Tudor Ambarus]

The function should return minimum size for output buffer
or error code if key hasn't been set.

Signed-off-by: Tudor Ambarus <tudor.amba...@microchip.com>
---
 crypto/dh.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/dh.c b/crypto/dh.c
index 7cec0498..325a5dd 100644
--- a/crypto/dh.c
+++ b/crypto/dh.c
@@ -148,7 +148,7 @@ static int dh_max_size(struct crypto_kpp *tfm)
 {
        struct dh_ctx *ctx = dh_get_ctx(tfm);
 
-       return mpi_get_size(ctx->p);
+       return ctx->p ? mpi_get_size(ctx->p) : -EINVAL;
 }
 
 static void dh_exit_tfm(struct crypto_kpp *tfm)
-- 
2.7.4