On Sun, Oct 04, 2020 at 07:04:28PM +0100, Matthew Wilcox (Oracle) wrote:
> On 32-bit systems, these shifts will overflow for files larger than 4GB.
> Add helper functions to avoid this problem coming back.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 73ff61dbe5ed ("Btrfs: fix device replace of a missing RAID 5/6 device")
> Fixes: be50a8ddaae1 ("Btrfs: Simplify scrub_setup_recheck_block()'s argument")
> Fixes: ff023aac3119 ("Btrfs: add code to scrub to copy read data to another disk")
> Fixes: b5d67f64f9bc ("Btrfs: change scrub to support big blocks")
> Fixes: a2de733c78fa ("btrfs: scrub")
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> ---
> fs/btrfs/scrub.c | 25 ++++++++++++++++---------
> 1 file changed, 16 insertions(+), 9 deletions(-)
>
> diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
> index 354ab9985a34..ccbaf9c6e87a 100644
> --- a/fs/btrfs/scrub.c
> +++ b/fs/btrfs/scrub.c
> @@ -1262,12 +1262,17 @@ static inline void scrub_stripe_index_and_offset(u64 logical, u64 map_type,
> }
> }
>
> +static u64 sblock_length(struct scrub_block *sblock)
> +{
> + return (u64)sblock->page_count * PAGE_SIZE;
page_count will be 32 at most, the type is int and this will never
overflow. The value is usualy number of pages in the arrays scrub_bio::pagev or
scrub_block::pagev bounded by SCRUB_PAGES_PER_WR_BIO (32) or
SCRUB_MAX_PAGES_PER_BLOCK (16). The scrub code does not use mappings
and it reads raw blocks to own pages and does the checksum verification.
