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authorNikos Tsironis <ntsironis@arrikto.com>2020-03-27 15:01:11 +0100
committerMike Snitzer <snitzer@redhat.com>2020-03-27 19:42:51 +0100
commit81d5553d1288c2ec0390f02f84d71ca0f0f9f137 (patch)
tree76cc780f85a499ce39c5cbbf585812d64625902f /drivers/md
parentdm clone: Add missing casts to prevent overflows and data corruption (diff)
downloadlinux-81d5553d1288c2ec0390f02f84d71ca0f0f9f137.tar.xz
linux-81d5553d1288c2ec0390f02f84d71ca0f0f9f137.zip
dm clone metadata: Fix return type of dm_clone_nr_of_hydrated_regions()
dm_clone_nr_of_hydrated_regions() returns the number of regions that have been hydrated so far. In order to do so it employs bitmap_weight(). Until now, the return type of dm_clone_nr_of_hydrated_regions() was unsigned long. Because bitmap_weight() returns an int, in case BITS_PER_LONG == 64 and the return value of bitmap_weight() is 2^31 (the maximum allowed number of regions for a device), the result is sign extended from 32 bits to 64 bits and an incorrect value is displayed, in the status output of dm-clone, as the number of hydrated regions. Fix this by having dm_clone_nr_of_hydrated_regions() return an unsigned int. Fixes: 7431b7835f55 ("dm: add clone target") Cc: stable@vger.kernel.org # v5.4+ Signed-off-by: Nikos Tsironis <ntsironis@arrikto.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-clone-metadata.c2
-rw-r--r--drivers/md/dm-clone-metadata.h2
-rw-r--r--drivers/md/dm-clone-target.c2
3 files changed, 3 insertions, 3 deletions
diff --git a/drivers/md/dm-clone-metadata.c b/drivers/md/dm-clone-metadata.c
index 199e7af00858..17712456fa63 100644
--- a/drivers/md/dm-clone-metadata.c
+++ b/drivers/md/dm-clone-metadata.c
@@ -656,7 +656,7 @@ bool dm_clone_is_range_hydrated(struct dm_clone_metadata *cmd,
return (bit >= (start + nr_regions));
}
-unsigned long dm_clone_nr_of_hydrated_regions(struct dm_clone_metadata *cmd)
+unsigned int dm_clone_nr_of_hydrated_regions(struct dm_clone_metadata *cmd)
{
return bitmap_weight(cmd->region_map, cmd->nr_regions);
}
diff --git a/drivers/md/dm-clone-metadata.h b/drivers/md/dm-clone-metadata.h
index 14af1ebd853f..d848b8799c07 100644
--- a/drivers/md/dm-clone-metadata.h
+++ b/drivers/md/dm-clone-metadata.h
@@ -156,7 +156,7 @@ bool dm_clone_is_range_hydrated(struct dm_clone_metadata *cmd,
/*
* Returns the number of hydrated regions.
*/
-unsigned long dm_clone_nr_of_hydrated_regions(struct dm_clone_metadata *cmd);
+unsigned int dm_clone_nr_of_hydrated_regions(struct dm_clone_metadata *cmd);
/*
* Returns the first unhydrated region with region_nr >= @start
diff --git a/drivers/md/dm-clone-target.c b/drivers/md/dm-clone-target.c
index ca5020c58f7c..5ce96ddf1ce1 100644
--- a/drivers/md/dm-clone-target.c
+++ b/drivers/md/dm-clone-target.c
@@ -1473,7 +1473,7 @@ static void clone_status(struct dm_target *ti, status_type_t type,
goto error;
}
- DMEMIT("%u %llu/%llu %llu %lu/%lu %u ",
+ DMEMIT("%u %llu/%llu %llu %u/%lu %u ",
DM_CLONE_METADATA_BLOCK_SIZE,
(unsigned long long)(nr_metadata_blocks - nr_free_metadata_blocks),
(unsigned long long)nr_metadata_blocks,