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a5265497a4
Fixes: 1a9ee36734 ("kernel: backport mtd dynamic partition patch")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
From 7ec4cdb321738d44ae5d405e7b6ac73dfbf99caa Mon Sep 17 00:00:00 2001
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From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
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Date: Mon, 25 Jul 2022 22:49:25 +0900
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Subject: [PATCH] mtd: core: check partition before dereference
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syzbot is reporting NULL pointer dereference at mtd_check_of_node() [1],
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for mtdram test device (CONFIG_MTD_MTDRAM) is not partition.
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Link: https://syzkaller.appspot.com/bug?extid=fe013f55a2814a9e8cfd [1]
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Reported-by: syzbot <syzbot+fe013f55a2814a9e8cfd@syzkaller.appspotmail.com>
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Reported-by: kernel test robot <oliver.sang@intel.com>
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Fixes: ad9b10d1eaada169 ("mtd: core: introduce of support for dynamic partitions")
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Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
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CC: stable@vger.kernel.org
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Signed-off-by: Richard Weinberger <richard@nod.at>
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---
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drivers/mtd/mtdcore.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/drivers/mtd/mtdcore.c
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+++ b/drivers/mtd/mtdcore.c
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@@ -577,6 +577,8 @@ static void mtd_check_of_node(struct mtd
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return;
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/* Check if a partitions node exist */
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+ if (!mtd_is_partition(mtd))
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+ return;
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parent = mtd->parent;
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parent_dn = dev_of_node(&parent->dev);
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if (!parent_dn)
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