From 2ad50606f847a902303a5364b7cad64bdd6246f6 Mon Sep 17 00:00:00 2001 From: Ondrej Mosnáček Date: Mon, 5 Jun 2017 17:52:39 +0200 Subject: 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 Acked-by: Mikulas Patocka Signed-off-by: Mike Snitzer --- drivers/md/dm-integrity.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/md/dm-integrity.c') diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c index 7910bfe50da4..4ab10cf718c9 100644 --- a/drivers/md/dm-integrity.c +++ b/drivers/md/dm-integrity.c @@ -3040,6 +3040,11 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv) ti->error = "The device is too small"; 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) buffer_sectors = 1; -- cgit v1.2.3-59-g8ed1b