linux-kernel - [PATCH 4.19 60/74] btrfs: On error always free subvol_name in btrfs

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Message-Id: <20190204103627.804873370@linuxfoundation.org>
Date:   Mon,  4 Feb 2019 11:37:13 +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, Nikolay Borisov <nborisov@...e.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 4.19 60/74] btrfs: On error always free subvol_name in btrfs_mount

4.19-stable review patch.  If anyone has any objections, please let me know.

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

From: Eric W. Biederman <ebiederm@...ssion.com>

commit 532b618bdf237250d6d4566536d4b6ce3d0a31fe upstream.

The subvol_name is allocated in btrfs_parse_subvol_options and is
consumed and freed in mount_subvol.  Add a free to the error paths that
don't call mount_subvol so that it is guaranteed that subvol_name is
freed when an error happens.

Fixes: 312c89fbca06 ("btrfs: cleanup btrfs_mount() using btrfs_mount_root()")
Cc: stable@...r.kernel.org # v4.19+
Reviewed-by: Nikolay Borisov <nborisov@...e.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/btrfs/super.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1677,6 +1677,7 @@ static struct dentry *btrfs_mount(struct
 				flags | SB_RDONLY, device_name, data);
 			if (IS_ERR(mnt_root)) {
 				root = ERR_CAST(mnt_root);
+				kfree(subvol_name);
 				goto out;
 			}

@@ -1686,12 +1687,14 @@ static struct dentry *btrfs_mount(struct
 			if (error < 0) {
 				root = ERR_PTR(error);
 				mntput(mnt_root);
+				kfree(subvol_name);
 				goto out;
 			}
 		}
 	}
 	if (IS_ERR(mnt_root)) {
 		root = ERR_CAST(mnt_root);
+		kfree(subvol_name);
 		goto out;
 	}