[PATCH] crypto: drbg - Fix memleak in drbg_prepare_hrng

[Zheng Bin]

drbg_prepare_hrng
  drbg->jent = crypto_alloc_rng
  err = add_random_ready_callback
  default:
    drbg->random_ready.func = NULL  -->set NULL, if fail

drbg_uninstantiate
  if (drbg->random_ready.func)      -->If NULL, will not free drbg->jent
    crypto_free_rng(drbg->jent)

Need to free drbg->jent if add_random_ready_callback return fail.

Fixes: 97f2650e5040 ("crypto: drbg - always seeded with SP800-90B compliant 
noise source")
Signed-off-by: Zheng Bin <zhengbi...@huawei.com>
---
 crypto/drbg.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/crypto/drbg.c b/crypto/drbg.c
index 37526eb8c5d5..a643ab7eac7a 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -1524,6 +1524,8 @@ static int drbg_prepare_hrng(struct drbg_state *drbg)
                /* fall through */

        default:
+               crypto_free_rng(drbg->jent);
+               drbg->jent = NULL;
                drbg->random_ready.func = NULL;
                return err;
        }
--
2.26.0.106.g9fadedd