s390/crypto: unlock on error in prng_tdes_read()

commit 9e6e7c74315095fd40f41003850690c711e44420 upstream.

We added some new locking but forgot to unlock on error.

Fixes: 57127645d79d ("s390/zcrypt: Introduce new SHA-512 based Pseudo Random Generator.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/s390/crypto/prng.c b/arch/s390/crypto/prng.c
index 9cc050f9536c..1113389d0a39 100644
--- a/arch/s390/crypto/prng.c
+++ b/arch/s390/crypto/prng.c
@@ -507,8 +507,10 @@ static ssize_t prng_tdes_read(struct file *file, char __user *ubuf,
                 prng_data->prngws.byte_counter += n;
                 prng_data->prngws.reseed_counter += n;
 
-                if (copy_to_user(ubuf, prng_data->buf, chunk))
-                        return -EFAULT;
+                if (copy_to_user(ubuf, prng_data->buf, chunk)) {
+                        ret = -EFAULT;
+                        break;
+                }
 
                 nbytes -= chunk;
                 ret += chunk;