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| author |  Nikos Tsironis <ntsironis@arrikto.com>
| 2020-03-27 16:01:11 +0200 |
|---|---|---|
| committer |  Mike Snitzer <snitzer@redhat.com>
| 2020-03-27 14:42:51 -0400 |
| commit | 81d5553d1288c2ec0390f02f84d71ca0f0f9f137 (patch) | |
| tree | 76cc780f85a499ce39c5cbbf585812d64625902f /drivers/md/dm-clone-target.c | |
| parent | dm clone: Add missing casts to prevent overflows and data corruption (diff) | |
| download | linux-81d5553d1288c2ec0390f02f84d71ca0f0f9f137.tar.gz linux-81d5553d1288c2ec0390f02f84d71ca0f0f9f137.tar.bz2 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/dm-clone-target.c')
| -rw-r--r-- | drivers/md/dm-clone-target.c | 2 |
1 files changed, 1 insertions, 1 deletions
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, |