linux-kernel - [PATCH 1/2] mtd: rawnand: docg4: fix NULL deref while probing

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Message-Id: <30a41254ed09624a8972aa1daf14e4dd1efabed3.1531045014.git.cerg2010cerg2010@mail.ru>
Date:   Sun,  8 Jul 2018 14:29:23 +0300
From:   Sergey Larin <cerg2010cerg2010@...l.ru>
To:     unlisted-recipients:; (no To-header on input)
Cc:     boris.brezillon@...tlin.com, miquel.raynal@...tlin.com,
        richard@....at, dwmw2@...radead.org, computersforpeace@...il.com,
        marek.vasut@...il.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Sergey Larin <cerg2010cerg2010@...l.ru>
Subject: [PATCH 1/2] mtd: rawnand: docg4: fix NULL deref while probing

nand_scan_tail() invokes nand_chip->scan_bbt() at the end, which is not set
by the driver. Use the default nand_default_bbt() function to avoid NULL
dereferncing.

Signed-off-by: Sergey Larin <cerg2010cerg2010@...l.ru>
---
 drivers/mtd/nand/raw/docg4.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/nand/raw/docg4.c b/drivers/mtd/nand/raw/docg4.c
index bb96cb33cd6b..bbed8ea7858c 100644
--- a/drivers/mtd/nand/raw/docg4.c
+++ b/drivers/mtd/nand/raw/docg4.c
@@ -1269,6 +1269,7 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
 	nand->read_buf = docg4_read_buf;
 	nand->write_buf = docg4_write_buf16;
 	nand->erase = docg4_erase_block;
+	nand->scan_bbt = nand_default_bbt;
 	nand->set_features = nand_get_set_features_notsupp;
 	nand->get_features = nand_get_set_features_notsupp;
 	nand->ecc.read_page = docg4_read_page;
-- 
2.18.0