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btrfs: verify subvolid mount parameter 

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.

Up to now the memparse function accepts the K/M/G/ suffixes, that are
usually meant for size values and do not make sense for a subvolume it.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2018-02-15 01:11:37 +08:00 committed by David Sterba
parent 5811375325
commit ccb0e7d1c1
1 changed files with 9 additions and 12 deletions
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21
fs/btrfs/super.c
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@ -914,8 +914,8 @@ 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;
@ -945,18 +945,15 @@ 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");