From: Johan Hovold <johan@xxxxxxxxxx>
commit 388bb19be8eab4674a660e0c97eaf60775362bc7 upstream.
If a process is interrupted while accessing the crypto device and the
global ap_perms_mutex is contented, release() could return early and
fail to free related resources.
Fixes: 00fab2350e6b ("s390/zcrypt: multiple zcrypt device nodes support")
Cc: <stable@xxxxxxxxxxxxxxx> # 4.19
Cc: Harald Freudenberger <freude@xxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/s390/crypto/zcrypt_api.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -539,8 +539,7 @@ static int zcrypt_release(struct inode *
if (filp->f_inode->i_cdev == &zcrypt_cdev) {
struct zcdn_device *zcdndev;
- if (mutex_lock_interruptible(&ap_perms_mutex))
- return -ERESTARTSYS;
+ mutex_lock(&ap_perms_mutex);
zcdndev = find_zcdndev_by_devt(filp->f_inode->i_rdev);
mutex_unlock(&ap_perms_mutex);
if (zcdndev) {
