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regmap: irq: Fix possible ZERO_SIZE_PTR pointer dereferencing error. 

Since we cannot make sure the 'chip->num_regs' will always be none zero
from the users, and then if 'chip->num_regs' equals to zero by mistake
or other reasons, the kzalloc() will return ZERO_SIZE_PTR, which equals
to ((void *)16).

So this patch fix this with just checking the 'chip->num_regs' before
calling kzalloc().

This also sorts the header files in alphabetical order at the same time.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Xiubo Li 2014-05-19 15:13:45 +08:00 committed by Mark Brown
parent c9eaa447e7
commit e128920701
1 changed files with 6 additions and 3 deletions
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9
drivers/base/regmap/regmap-irq.c
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@ -10,13 +10,13 @@
* published by the Free Software Foundation.
*/
#include <linux/export.h>
#include <linux/device.h>
#include <linux/regmap.h>
#include <linux/irq.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include "internal.h"
@ -347,6 +347,9 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
int ret = -ENOMEM;
u32 reg;
if (chip->num_regs <= 0)
return -EINVAL;
for (i = 0; i < chip->num_irqs; i++) {
if (chip->irqs[i].reg_offset % map->reg_stride)
return -EINVAL;