ext4 crypto: exit cleanly if ext4_derive_key_aes() fails

Return value of ext4_derive_key_aes() is stored but not used.
Add test to exit cleanly if ext4_derive_key_aes() fail.
Also fix coverity CID 1309760.

Signed-off-by: Laurent Navet <laurent.navet@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ext4/crypto_key.c b/fs/ext4/crypto_key.c
index 442d24e8efc0..ce75bc8b9aef 100644
--- a/fs/ext4/crypto_key.c
+++ b/fs/ext4/crypto_key.c
@@ -220,6 +220,8 @@ retry:
         BUG_ON(master_key->size != EXT4_AES_256_XTS_KEY_SIZE);
         res = ext4_derive_key_aes(ctx.nonce, master_key->raw,
                                   raw_key);
+        if (res)
+                goto out;
 got_key:
         ctfm = crypto_alloc_ablkcipher(cipher_str, 0, 0);
         if (!ctfm || IS_ERR(ctfm)) {