linux-kernel - [PATCH 4.19 104/346] selinux: fix error initialization in inode_doinit_with

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Date:   Mon, 28 Dec 2020 13:47:03 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tianyue Ren <rentianyue@...inos.cn>,
        Paul Moore <paul@...l-moore.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 104/346] selinux: fix error initialization in inode_doinit_with_dentry()

From: Tianyue Ren <rentianyue@...inos.cn>

[ Upstream commit 83370b31a915493231e5b9addc72e4bef69f8d31 ]

Mark the inode security label as invalid if we cannot find
a dentry so that we will retry later rather than marking it
initialized with the unlabeled SID.

Fixes: 9287aed2ad1f ("selinux: Convert isec->lock into a spinlock")
Signed-off-by: Tianyue Ren <rentianyue@...inos.cn>
[PM: minor comment tweaks]
Signed-off-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 security/selinux/hooks.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 250b725f5754c..02afe52a55d0d 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1618,7 +1618,13 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 			 * inode_doinit with a dentry, before these inodes could
 			 * be used again by userspace.
 			 */
-			goto out;
+			isec->initialized = LABEL_INVALID;
+			/*
+			 * There is nothing useful to jump to the "out"
+			 * label, except a needless spin lock/unlock
+			 * cycle.
+			 */
+			return 0;
 		}
 
 		len = INITCONTEXTLEN;
@@ -1733,8 +1739,15 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 			 * inode_doinit() with a dentry, before these inodes
 			 * could be used again by userspace.
 			 */
-			if (!dentry)
-				goto out;
+			if (!dentry) {
+				isec->initialized = LABEL_INVALID;
+				/*
+				 * There is nothing useful to jump to the "out"
+				 * label, except a needless spin lock/unlock
+				 * cycle.
+				 */
+				return 0;
+			}
 			rc = selinux_genfs_get_sid(dentry, sclass,
 						   sbsec->flags, &sid);
 			dput(dentry);
-- 
2.27.0