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.j...@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
--
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