blob: 5cfaed31dd5276c87991824e713e943d8bd2cbfb [file] [log] [blame]
From 0ca8c6e99a71eb7bec39c822846dc0ab2cd3a968 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Thu, 10 Oct 2019 15:13:33 +0200
Subject: [PATCH] s390/zcrypt: fix memleak at release
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@vger.kernel.org> # 4.19
Cc: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
index 1058b4b5cc1e..35a0e9569239 100644
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -539,8 +539,7 @@ static int zcrypt_release(struct inode *inode, struct file *filp)
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) {
--
2.7.4