If someone called this function before a successful setkey,
we would end up in a NULL dereference.
The function should return minimum size for output buffer
or error code if key hasn't been set.
Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
---
crypto/dh.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/crypto/dh.c b/crypto/dh.c
index 7cec0498..3d35ba9 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) : -ENOKEY;
}
static void dh_exit_tfm(struct crypto_kpp *tfm)
--
2.7.4
