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dm space map: always set ev if sm_ll_mutate() succeeds

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If no block was allocated or freed, sm_ll_mutate() wasn't setting
*ev, leaving the variable unitialized. sm_ll_insert(),
sm_disk_inc_block(), and sm_disk_new_block() all check ev to see
if there was an allocation event in sm_ll_mutate(), possibly
reading unitialized data.

If no allocation event occured, sm_ll_mutate() should set *ev
to SM_NONE.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Benjamin Marzinski 2016-12-04 23:26:38 -06:00 committed by Mike Snitzer
parent 0c79ce0b75
commit b446396b74
1 changed files with 2 additions and 1 deletions
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3
drivers/md/persistent-data/dm-space-map-common.c
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@ -464,7 +464,8 @@ static int sm_ll_mutate(struct ll_disk *ll, dm_block_t b,
ll->nr_allocated--;
le32_add_cpu(&ie_disk.nr_free, 1);
ie_disk.none_free_before = cpu_to_le32(min(le32_to_cpu(ie_disk.none_free_before), bit));
}
} else
*ev = SM_NONE;
return ll->save_ie(ll, index, &ie_disk);
}