On 5.10.2018 11:25, Qu Wenruo wrote:
> Add extra dev extent end check against device boundary.
>
> Signed-off-by: Qu Wenruo <w...@suse.com>
> ---
> fs/btrfs/volumes.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index bf0b2c16847a..9fb40e30be6a 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -7492,6 +7492,7 @@ int btrfs_verify_dev_extents(struct btrfs_fs_info
> *fs_info)
> while (1) {
> struct extent_buffer *leaf = path->nodes[0];
> struct btrfs_dev_extent *dext;
> + struct btrfs_device *dev;
> int slot = path->slots[0];
> u64 chunk_offset;
> u64 physical_offset;
> @@ -7517,6 +7518,22 @@ int btrfs_verify_dev_extents(struct btrfs_fs_info
> *fs_info)
> goto out;
> }
>
> + /* Make sure no dev extent is beyond device bondary */
> + dev = btrfs_find_device(fs_info, devid, NULL, NULL);
> + if (!dev) {
> + btrfs_err(fs_info, "failed to find devid %llu", devid);
> + ret = -EUCLEAN;
> + goto out;
> + }
> + if (physical_offset + physical_len > dev->disk_total_bytes) {
> + btrfs_err(fs_info,
> +"dev extent devid %llu physical offset %llu len %llu is beyond device
> boundary %llu",
> + devid, physical_offset, physical_len,
> + dev->disk_total_bytes);
> + ret = -EUCLEAN;
> + goto out;
> + }
Why not move this code in verify_one_dev_extent, you already have all
the necessary context in there - devid and physical_len/physical_offset,
let's avoid scattering logically related code in different places. ?
> +
> ret = verify_one_dev_extent(fs_info, chunk_offset, devid,
> physical_offset, physical_len);
> if (ret < 0)
>
