[PATCH v3] btrfs: verify max_inline mount parameter

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

We aren't verifying the parameter passed to the max_inline mount option.
So we won't fail the mount if a junk value is specified, for example,
-o max_inline=abc. This patch checks if input is valid.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
v2->v3: Handle parameter with unit, such as 4K. Use memparse() 2nd arg.
v1->v2: use match_int ret value if error
        use %u instead of %d for parser

 fs/btrfs/super.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 77e0537e1db5..76b58da8d56d 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -605,7 +605,14 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
 		case Opt_max_inline:
 			num = match_strdup(&args[0]);
 			if (num) {
-				info->max_inline = memparse(num, NULL);
+				char *retptr;
+
+				info->max_inline = memparse(num, &retptr);
+				if (*retptr != '\0') {
+					ret = -EINVAL;
+					kfree(num);
+					goto out;
+				}
 				kfree(num);
 
 				if (info->max_inline) {
-- 
2.15.0