mtd: core: check partition before dereference

syzbot is reporting NULL pointer dereference at mtd_check_of_node() [1], for mtdram test device (CONFIG_MTD_MTDRAM) is not partition.

Tetsuo Handa committed 4 years ago

Commit 7ec4cdb1 parent 96615241 file · +2 −0Browse files

Unified · Split

@@ -559,6 +559,8 @@ static void mtd_check_of_node(struct mtd_info *mtd) · 558 unmodified lines
559	559	return;
560	560
561	561	/* Check if a partitions node exist */
	562	+ if (!mtd_is_partition(mtd))
	563	+ return;
562	564	parent = mtd->parent;
563	565	parent_dn = dev_of_node(&parent->dev);
564	566	if (!parent_dn)