On 21/05/2021 10:40, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> In the case where recursing(mm) is true variable r2 is not
> inintialized and an uninitialized value is being used in the
> call combine_errors later on. Fix this by setting r2 to zero.
>
> Addresses-Coverity: ("Uninitialized scalar variable")
> Fixes: def6a7a9a7f0 ("dm space maps: improve performance with inc/dec on ranges of blocks")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> ---
> drivers/md/persistent-data/dm-space-map-metadata.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/md/persistent-data/dm-space-map-metadata.c b/drivers/md/persistent-data/dm-space-map-metadata.c
> index 3b70ee861cf5..5be5ef4c831f 100644
> --- a/drivers/md/persistent-data/dm-space-map-metadata.c
> +++ b/drivers/md/persistent-data/dm-space-map-metadata.c
> @@ -432,9 +432,10 @@ static int sm_metadata_dec_blocks(struct dm_space_map *sm, dm_block_t b, dm_bloc
> int32_t nr_allocations;
> struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
>
> - if (recursing(smm))
> + if (recursing(smm)) {
> r = add_bop(smm, BOP_DEC, b, e);
> - else {
> + r2 = 0;
> + } else {
> in(smm);
> r = sm_ll_dec(&smm->ll, b, e, &nr_allocations);
> r2 = out(smm);
>
There is a another occurrence of this, I'll send a V2 shortly
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