From: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Date: Mon, 31 Mar 2014 10:03:25 +0000 (+0800)
Subject: btrfs: filter invalid arg for btrfs resize
X-Git-Tag: submit/tizen/20160607.132125~4568^2~23
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9a40f1222a372de77344d85d31f8fe0e1c0e60e7;p=sdk%2Femulator%2Femulator-kernel.git

btrfs: filter invalid arg for btrfs resize

Originally following cmds will work:
	# btrfs fi resize -10A  <mnt>
	# btrfs fi resize -10Gaha <mnt>
Filter the arg by checking the return pointer of memparse.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 59622366c613..05f8df866e4c 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1472,6 +1472,7 @@ static noinline int btrfs_ioctl_resize(struct file *file,
 	struct btrfs_trans_handle *trans;
 	struct btrfs_device *device = NULL;
 	char *sizestr;
+	char *retptr;
 	char *devstr = NULL;
 	int ret = 0;
 	int mod = 0;
@@ -1539,8 +1540,8 @@ static noinline int btrfs_ioctl_resize(struct file *file,
 			mod = 1;
 			sizestr++;
 		}
-		new_size = memparse(sizestr, NULL);
-		if (new_size == 0) {
+		new_size = memparse(sizestr, &retptr);
+		if (*retptr != '\0' || new_size == 0) {
 			ret = -EINVAL;
 			goto out_free;
 		}