Re: [syzbot] [dm?] WARNING: zero-size vmalloc in cache_ctr

[Edward Adam Davis]

From: Edward Aadm Davis <eadavis@xxxxxxxx>

#syz test

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 1a5072425c4a..e3a202f0b08d 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2149,6 +2149,11 @@ static int parse_origin_dev(struct cache_args *ca, struct dm_arg_set *as,
 		return r;
 	}
 
+	if (ca->ti->len > get_dev_size(ca->origin_dev)) {
+		*error = "Device size larger than cached device";
+		return -EINVAL;
+	}
+
 	return 0;
 }