diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index a85cf7d..362879d 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1771,6 +1771,14 @@
 	unsigned long map_len = 0;
 	int err;
 
+	if (low > high) {
+		btrfs_err(eb->fs_info,
+		 "%s: low (%d) > high (%d) eb %llu owner %llu level %d",
+			  __func__, low, high, eb->start,
+			  btrfs_header_owner(eb), btrfs_header_level(eb));
+		return -EINVAL;
+	}
+
 	while (low < high) {
 		mid = (low + high) / 2;
 		offset = p + mid * item_size;