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authorMilan Broz <gmazyland@gmail.com>2018-11-08 00:24:55 +0300
committerMike Snitzer <snitzer@redhat.com>2018-12-18 17:02:26 +0300
commitef87bfc24f9b8da82c89aff493df20f078bc9cb1 (patch)
tree9f0f98dbf82d895699bcf1036b326df2ac6d464f /drivers/md/dm-linear.c
parent8d683dcd65c037efc9fb38c696ec9b65b306e573 (diff)
downloadlinux-ef87bfc24f9b8da82c89aff493df20f078bc9cb1.tar.xz
dm: Check for device sector overflow if CONFIG_LBDAF is not set
Reference to a device in device-mapper table contains offset in sectors. If the sector_t is 32bit integer (CONFIG_LBDAF is not set), then several device-mapper targets can overflow this offset and validity check is then performed on a wrong offset and a wrong table is activated. See for example (on 32bit without CONFIG_LBDAF) this overflow: # dmsetup create test --table "0 2048 linear /dev/sdg 4294967297" # dmsetup table test 0 2048 linear 8:96 1 This patch adds explicit check for overflow if the offset is sector_t type. Signed-off-by: Milan Broz <gmazyland@gmail.com> Reviewed-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-linear.c')
-rw-r--r--drivers/md/dm-linear.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 8d7ddee6ac4d..ad980a38fb1e 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -45,7 +45,7 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
ret = -EINVAL;
- if (sscanf(argv[1], "%llu%c", &tmp, &dummy) != 1) {
+ if (sscanf(argv[1], "%llu%c", &tmp, &dummy) != 1 || tmp != (sector_t)tmp) {
ti->error = "Invalid device sector";
goto bad;
}