Actually check if mtd dev have a parent to fix NULL pointer dereference kernel panic in mtd_check_of_node.

Reported-by: kernel test robot oliver.sang@intel.com Fixes: ad9b10d1eaad ("mtd: core: introduce of support for dynamic partitions") Cc: stable@vger.kernel.org Signed-off-by: Christian Marangi ansuelsmth@gmail.com --- drivers/mtd/mtdcore.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 6fafea80fd98..48a357fcf2ed 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -558,8 +558,12 @@ static void mtd_check_of_node(struct mtd_info *mtd) if (dev_of_node(&mtd->dev)) return;

- /* Check if a partitions node exist */ + /* Make sure we have a parent */ parent = mtd->parent; + if (!parent) + return; + + /* Check if a partitions node exist */ parent_dn = dev_of_node(&parent->dev); if (!parent_dn) return;