From: Filipe Manana <fdmanana@xxxxxxxx>
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@xxxxxxxx>
---
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
