[PATCH] Btrfs: ensure path name is null terminated at btrfs_control_ioctl

[fdmanana@kernel.org]

From: Filipe Manana <fdmanana@suse.com>

We were using the path name received from user space without checking that
it is null terminated. While btrfs-progs is well behaved and does proper
validation and null termination, someone could call the ioctl and pass
a non-null terminated patch, leading to buffer overrun problems in the
kernel.

So just set the last byte of the path to a null character, similar to what
we do in other ioctls (add/remove/resize device, snapshot creation, etc).

Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
 fs/btrfs/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 6601c9aa5e35..8ad145820ea8 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2235,6 +2235,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
 	vol = memdup_user((void __user *)arg, sizeof(*vol));
 	if (IS_ERR(vol))
 		return PTR_ERR(vol);
+	vol->name[BTRFS_PATH_NAME_MAX] = '\0';
 
 	switch (cmd) {
 	case BTRFS_IOC_SCAN_DEV:
-- 
2.11.0