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btrfs: filter invalid arg for btrfs resize

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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>
This commit is contained in:
Gui Hecheng 2014-03-31 18:03:25 +08:00 committed by Chris Mason
parent 766b5e5ae7
commit 9a40f1222a
1 changed files with 3 additions and 2 deletions
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5
fs/btrfs/ioctl.c
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@ -1472,6 +1472,7 @@ static noinline int btrfs_ioctl_resize(struct file *file,
struct btrfs_trans_handle *trans; struct btrfs_trans_handle *trans;
struct btrfs_device *device = NULL; struct btrfs_device *device = NULL;
char *sizestr; char *sizestr;
char *retptr;
char *devstr = NULL; char *devstr = NULL;
int ret = 0; int ret = 0;
int mod = 0; int mod = 0;
@ -1539,8 +1540,8 @@ static noinline int btrfs_ioctl_resize(struct file *file,
mod = 1; mod = 1;
sizestr++; sizestr++;
} }
new_size = memparse(sizestr, NULL); new_size = memparse(sizestr, &retptr);
if (new_size == 0) { if (*retptr != '\0' || new_size == 0) {
ret = -EINVAL; ret = -EINVAL;
goto out_free; goto out_free;
} }