diff --git a/fs/squashfs/id.c b/fs/squashfs/id.c
index 6be5afe7287d..5ef450239761 100644
--- a/fs/squashfs/id.c
+++ b/fs/squashfs/id.c
@@ -35,10 +35,17 @@ int squashfs_get_id(struct super_block *sb, unsigned int index,
 	struct squashfs_sb_info *msblk = sb->s_fs_info;
 	int block = SQUASHFS_ID_BLOCK(index);
 	int offset = SQUASHFS_ID_BLOCK_OFFSET(index);
-	u64 start_block = le64_to_cpu(msblk->id_table[block]);
+	u64 start_block;
 	__le32 disk_id;
 	int err;
 
+	// sanity check
+	if (le64_to_cpu(msblk->id_table[0]) + block >= msblk->xattr_table) {
+		return -EINVAL;
+	}
+
+	start_block = le64_to_cpu(msblk->id_table[block]);
+
 	err = squashfs_read_metadata(sb, &disk_id, &start_block, &offset,
 							sizeof(disk_id));
 	if (err < 0)