[PATCH 5.2 081/124] libceph: dont call crypto_free_sync_skcipher() on a NULL tfm

[Greg Kroah-Hartman]

From: Jia-Ju Bai <baijiaju1...@gmail.com>

[ Upstream commit e8c99200b4d117c340c392ebd5e62d85dfeed027 ]

In set_secret(), key->tfm is assigned to NULL on line 55, and then
ceph_crypto_key_destroy(key) is executed.

ceph_crypto_key_destroy(key)
  crypto_free_sync_skcipher(key->tfm)
    crypto_free_skcipher(&tfm->base);

This happens to work because crypto_sync_skcipher is a trivial wrapper
around crypto_skcipher: &tfm->base is still 0 and crypto_free_skcipher()
handles that.  Let's not rely on the layout of crypto_sync_skcipher.

This bug is found by a static analysis tool STCheck written by us.

Fixes: 69d6302b65a8 ("libceph: Remove VLA usage of skcipher").
Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com>
Reviewed-by: Ilya Dryomov <idryo...@gmail.com>
Signed-off-by: Ilya Dryomov <idryo...@gmail.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 net/ceph/crypto.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ceph/crypto.c b/net/ceph/crypto.c
index 5d6724cee38f9..4f75df40fb121 100644
--- a/net/ceph/crypto.c
+++ b/net/ceph/crypto.c
@@ -136,8 +136,10 @@ void ceph_crypto_key_destroy(struct ceph_crypto_key *key)
        if (key) {
                kfree(key->key);
                key->key = NULL;
-               crypto_free_sync_skcipher(key->tfm);
-               key->tfm = NULL;
+               if (key->tfm) {
+                       crypto_free_sync_skcipher(key->tfm);
+                       key->tfm = NULL;
+               }
        }
 }
 
-- 
2.20.1