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s390/crypto: unlock on error in prng_tdes_read()

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commit 9e6e7c7431 upstream.

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

Fixes: 57127645d7 ("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>
This commit is contained in:
Dan Carpenter
2016-11-18 14:11:00 +03:00
committed by Greg Kroah-Hartman
parent 5d7d362abc
commit a05aa258b2
1 changed files with 4 additions and 2 deletions
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6
arch/s390/crypto/prng.c
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@@ -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;