[PATCH V2] btrfs: trivial fix, a potential memory leak in btrfs_parse_early_options()

[Jeff Liu <jeff.liu@oracle.com>]

Signed-off-by: Jie Liu <jeff.liu@oracle.com>

---
 fs/btrfs/super.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 15634d4..16f31e1 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -406,7 +406,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
 		u64 *subvol_rootid, struct btrfs_fs_devices **fs_devices)
 {
 	substring_t args[MAX_OPT_ARGS];
-	char *opts, *orig, *p;
+	char *device_name, *opts, *orig, *p;
 	int error = 0;
 	int intarg;
 
@@ -457,8 +457,14 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
 			}
 			break;
 		case Opt_device:
-			error = btrfs_scan_one_device(match_strdup(&args[0]),
+			device_name = match_strdup(&args[0]);
+			if (!device_name) {
+				error = -ENOMEM;
+				goto out_free_opts;
+			}
+			error = btrfs_scan_one_device(device_name,
 					flags, holder, fs_devices);
+			kfree(device_name);
 			if (error)
 				goto out_free_opts;
 			break;
-- 
1.7.4.1