[PATCH v2] btrfs: verify subvolid mount parameter

[Anand Jain <anand.jain@oracle.com>]

We aren't verifying the parameter passed to the subvolid mount option,
so we won't report and fail the mount if a junk value is specified for
example, -o subvolid=abc.
This patch verifies the subvolid option with match_u64.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
v1->v2:
 Title changed. Old:
   btrfs: manage subvolid mount option with match_u64
 Change log updated.
 keep the %s as token verification.

 fs/btrfs/super.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 10f7d0fbd50f..0333b8802a02 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -976,8 +976,8 @@ static int btrfs_parse_subvol_options(const char *options, fmode_t flags,
 {
 	substring_t args[MAX_OPT_ARGS];
 	char *opts, *orig, *p;
-	char *num = NULL;
 	int error = 0;
+	u64 subvolid;
 
 	if (!options)
 		return 0;
@@ -1007,18 +1007,15 @@ static int btrfs_parse_subvol_options(const char *options, fmode_t flags,
 			}
 			break;
 		case Opt_subvolid:
-			num = match_strdup(&args[0]);
-			if (num) {
-				*subvol_objectid = memparse(num, NULL);
-				kfree(num);
-				/* we want the original fs_tree */
-				if (!*subvol_objectid)
-					*subvol_objectid =
-						BTRFS_FS_TREE_OBJECTID;
-			} else {
-				error = -EINVAL;
+			error = match_u64(&args[0], &subvolid);
+			if (error)
 				goto out;
-			}
+
+			/* we want the original fs_tree */
+			if (subvolid == 0)
+				subvolid = BTRFS_FS_TREE_OBJECTID;
+
+			*subvol_objectid = subvolid;
 			break;
 		case Opt_subvolrootid:
 			pr_warn("BTRFS: 'subvolrootid' mount option is deprecated and has no effect\n");
-- 
2.15.0