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mtd: core: check partition before dereference

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

Link: https://syzkaller.appspot.com/bug?extid=fe013f55a2814a9e8cfd [1]
Reported-by: syzbot <syzbot+fe013f55a2814a9e8cfd@syzkaller.appspotmail.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Fixes: ad9b10d1ea ("mtd: core: introduce of support for dynamic partitions")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
CC: stable@vger.kernel.org
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Tetsuo Handa 2022-07-25 22:49:25 +09:00 committed by Richard Weinberger
parent 9661524b9b
commit 7ec4cdb321
1 changed files with 2 additions and 0 deletions
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2
drivers/mtd/mtdcore.c
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@ -559,6 +559,8 @@ static void mtd_check_of_node(struct mtd_info *mtd)
return;
/* Check if a partitions node exist */
if (!mtd_is_partition(mtd))
return;
parent = mtd->parent;
parent_dn = dev_of_node(&parent->dev);
if (!parent_dn)