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	return;	559	return;
560		560
561	/* Check if a partitions node exist */	561	/* Check if a partitions node exist */
		562	if (!mtd_is_partition(mtd))
		563	return;
562	parent = mtd->parent;	564	parent = mtd->parent;
563	parent_dn = dev_of_node(&parent->dev);	565	parent_dn = dev_of_node(&parent->dev);
564	if (!parent_dn)	566	if (!parent_dn)