linux-kernel - Applied "regmap: fix a NULL pointer dereference in __regmap

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Message-Id: <E1ZWQ4H-0000AO-F2@finisterre>
Date:	Mon, 31 Aug 2015 15:28:17 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Mark Brown <broonie@...nel.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Applied "regmap: fix a NULL pointer dereference in __regmap_init" to the regmap tree

The patch

   regmap: fix a NULL pointer dereference in __regmap_init

has been applied to the regmap tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 17649c90ff4c5246bb4babf6260029968a6d119d Mon Sep 17 00:00:00 2001
From: Sergey SENOZHATSKY <sergey.senozhatsky.work@...il.com>
Date: Mon, 31 Aug 2015 18:54:58 +0900
Subject: [PATCH] regmap: fix a NULL pointer dereference in __regmap_init

__regmap_init() may receive a NULL `struct regmap_bus *bus' pointer,
for example, from snd_hdac_regmap_init(), and it make sure that it
does not NULL deference `bus`, except around ->max_raw_read and
->max_raw_write initialisation. Add missing check.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/base/regmap/regmap.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index d2efa4b..2ffdb62 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -579,8 +579,10 @@ struct regmap *regmap_init(struct device *dev,
 	map->use_single_read = config->use_single_rw || !bus || !bus->read;
 	map->use_single_write = config->use_single_rw || !bus || !bus->write;
 	map->can_multi_write = config->can_multi_write && bus && bus->write;
-	map->max_raw_read = bus->max_raw_read;
-	map->max_raw_write = bus->max_raw_write;
+	if (bus) {
+		map->max_raw_read = bus->max_raw_read;
+		map->max_raw_write = bus->max_raw_write;
+	}
 	map->dev = dev;
 	map->bus = bus;
 	map->bus_context = bus_context;
-- 
2.5.0

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