* [PATCH] regmap: fix NULL pointer dereference in regmap_get_val_endian
@ 2014-09-18 9:42 Pankaj Dubey
2014-09-18 17:55 ` Mark Brown
0 siblings, 1 reply; 2+ messages in thread
From: Pankaj Dubey @ 2014-09-18 9:42 UTC (permalink / raw)
To: linux-kernel; +Cc: broonie, gregkh, naushad, Pankaj Dubey
Recents commits for getting reg endianness causing NULL pointer
dereference if dev is passed NULL in regmap_init_mmio. This patch
fixes this issue, and allows to parse reg endianness only if dev
and dev->of_node exist.
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
---
drivers/base/regmap/regmap.c | 23 ++++++++++++++---------
1 file changed, 14 insertions(+), 9 deletions(-)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index f2281af..455a877 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -477,7 +477,7 @@ static enum regmap_endian regmap_get_val_endian(struct device *dev,
const struct regmap_bus *bus,
const struct regmap_config *config)
{
- struct device_node *np = dev->of_node;
+ struct device_node *np;
enum regmap_endian endian;
/* Retrieve the endianness specification from the regmap config */
@@ -487,15 +487,20 @@ static enum regmap_endian regmap_get_val_endian(struct device *dev,
if (endian != REGMAP_ENDIAN_DEFAULT)
return endian;
- /* Parse the device's DT node for an endianness specification */
- if (of_property_read_bool(np, "big-endian"))
- endian = REGMAP_ENDIAN_BIG;
- else if (of_property_read_bool(np, "little-endian"))
- endian = REGMAP_ENDIAN_LITTLE;
+ /* If the dev and dev->of_node exist try to get endianness from DT */
+ if (dev && dev->of_node) {
+ np = dev->of_node;
- /* If the endianness was specified in DT, use that */
- if (endian != REGMAP_ENDIAN_DEFAULT)
- return endian;
+ /* Parse the device's DT node for an endianness specification */
+ if (of_property_read_bool(np, "big-endian"))
+ endian = REGMAP_ENDIAN_BIG;
+ else if (of_property_read_bool(np, "little-endian"))
+ endian = REGMAP_ENDIAN_LITTLE;
+
+ /* If the endianness was specified in DT, use that */
+ if (endian != REGMAP_ENDIAN_DEFAULT)
+ return endian;
+ }
/* Retrieve the endianness specification from the bus config */
if (bus && bus->val_format_endian_default)
--
1.7.9.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] regmap: fix NULL pointer dereference in regmap_get_val_endian
2014-09-18 9:42 [PATCH] regmap: fix NULL pointer dereference in regmap_get_val_endian Pankaj Dubey
@ 2014-09-18 17:55 ` Mark Brown
0 siblings, 0 replies; 2+ messages in thread
From: Mark Brown @ 2014-09-18 17:55 UTC (permalink / raw)
To: Pankaj Dubey; +Cc: linux-kernel, gregkh, naushad
[-- Attachment #1: Type: text/plain, Size: 307 bytes --]
On Thu, Sep 18, 2014 at 03:12:20PM +0530, Pankaj Dubey wrote:
> Recents commits for getting reg endianness causing NULL pointer
> dereference if dev is passed NULL in regmap_init_mmio. This patch
> fixes this issue, and allows to parse reg endianness only if dev
> and dev->of_node exist.
Applied, thanks.
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2014-09-18 17:56 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-09-18 9:42 [PATCH] regmap: fix NULL pointer dereference in regmap_get_val_endian Pankaj Dubey
2014-09-18 17:55 ` Mark Brown
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.