From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
[ Upstream commit 45fc728515c14f53f6205789de5bfd72a95af3b8 ]
The devices with size >= 2^63 bytes can't be used reliably by userspace
because the type off_t is a signed 64-bit integer.
Therefore, we limit the maximum size of a device mapper device to
2^63-512 bytes.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/md/dm-table.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index aabb2435070b8..9e3f8c737c487 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -670,6 +670,10 @@ int dm_table_add_target(struct dm_table *t, const char *type,
DMERR("%s: zero-length target", dm_device_name(t->md));
return -EINVAL;
}
+ if (start + len < start || start + len > LLONG_MAX >> SECTOR_SHIFT) {
+ DMERR("%s: too large device", dm_device_name(t->md));
+ return -EINVAL;
+ }
ti->type = dm_get_target_type(type);
if (!ti->type) {
--
2.39.5
