md: dm-zoned-target: Initialize return variable r to avoid uninitialized use

Fix Smatch-detected error:
drivers/md/dm-zoned-target.c:1073 dmz_iterate_devices()
error: uninitialized symbol 'r'.

Smatch detects a possible use of the uninitialized variable 'r' in
dmz_iterate_devices() because if dmz->nr_ddevs is zero, the loop is
skipped and 'r' is returned without being set, leading to undefined
behavior.

Initialize 'r' to 0 before the loop. This ensures that if there are no
devices to iterate over, the function still returns a defined value.

Signed-off-by: Purva Yeshi <purvayeshi550@gmail.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index 5da3db06da10300843fc72e894c1a0c4a99588da..9da329078ea4a19ddb3bc5f84fcfa0d1b3f78613 100644 (file)
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -1062,7 +1062,7 @@ static int dmz_iterate_devices(struct dm_target *ti,
        struct dmz_target *dmz = ti->private;
        unsigned int zone_nr_sectors = dmz_zone_nr_sectors(dmz->metadata);
        sector_t capacity;
-       int i, r;
+       int i, r = 0;
 
        for (i = 0; i < dmz->nr_ddevs; i++) {
                capacity = dmz->dev[i].capacity & ~(zone_nr_sectors - 1);