linux-kernel - [PATCH 3.16 35/72] hypfs: Fix error number left in struct pointer member

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Message-ID: <lsq.1575813165.422392579@decadent.org.uk>
Date:   Sun, 08 Dec 2019 13:53:19 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Martin Schwidefsky" <schwidefsky@...ibm.com>,
        "David Howells" <dhowells@...hat.com>,
        "Al Viro" <viro@...iv.linux.org.uk>, linux-s390@...r.kernel.org,
        "Heiko Carstens" <heiko.carstens@...ibm.com>
Subject: [PATCH 3.16 35/72] hypfs: Fix error number left in struct pointer
 member

3.16.79-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: David Howells <dhowells@...hat.com>

commit b54c64f7adeb241423cd46598f458b5486b0375e upstream.

In hypfs_fill_super(), if hypfs_create_update_file() fails,
sbi->update_file is left holding an error number.  This is passed to
hypfs_kill_super() which doesn't check for this.

Fix this by not setting sbi->update_value until after we've checked for
error.

Fixes: 24bbb1faf3f0 ("[PATCH] s390_hypfs filesystem")
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Martin Schwidefsky <schwidefsky@...ibm.com>
cc: Heiko Carstens <heiko.carstens@...ibm.com>
cc: linux-s390@...r.kernel.org
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/s390/hypfs/inode.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -275,7 +275,7 @@ static int hypfs_show_options(struct seq
 static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
 {
 	struct inode *root_inode;
-	struct dentry *root_dentry;
+	struct dentry *root_dentry, *update_file;
 	int rc = 0;
 	struct hypfs_sb_info *sbi;
 
@@ -306,9 +306,10 @@ static int hypfs_fill_super(struct super
 		rc = hypfs_diag_create_files(root_dentry);
 	if (rc)
 		return rc;
-	sbi->update_file = hypfs_create_update_file(root_dentry);
-	if (IS_ERR(sbi->update_file))
-		return PTR_ERR(sbi->update_file);
+	update_file = hypfs_create_update_file(root_dentry);
+	if (IS_ERR(update_file))
+		return PTR_ERR(update_file);
+	sbi->update_file = update_file;
 	hypfs_update_update(sb);
 	pr_info("Hypervisor filesystem mounted\n");
 	return 0;