@@ -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");
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(-)