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dm integrity: reject mappings too large for device 

dm-integrity would successfully create mappings with the number of
sectors greater than the provided data sector count.  Attempts to read
sectors of this mapping that were beyond the provided data sector count
would then yield run-time messages of the form "device-mapper:
integrity: Too big sector number: ...".

Fix this by emitting an error when the requested mapping size is bigger
than the provided data sector count.

Signed-off-by: Ondrej Mosnacek <omosnacek@gmail.com>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Ondrej Mosnáček 2017-06-05 17:52:39 +02:00 committed by Mike Snitzer
parent 32c1431eea
commit 2ad50606f8
1 changed files with 5 additions and 0 deletions
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5
drivers/md/dm-integrity.c
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@ -3040,6 +3040,11 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
ti->error = "The device is too small"; ti->error = "The device is too small";
goto bad; goto bad;
} }
if (ti->len > ic->provided_data_sectors) {
r = -EINVAL;
ti->error = "Not enough provided sectors for requested mapping size";
goto bad;
}
if (!buffer_sectors) if (!buffer_sectors)
buffer_sectors = 1; buffer_sectors = 1;