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iio: stmpe-adc: Use correctly sized arguments for bit field 

The find.h APIs are designed to be used only on unsigned long arguments.
This can technically result in a over-read, but it is harmless in this
case. Regardless, fix it to avoid the warning seen under -Warray-bounds,
which we'd like to enable globally:

In file included from ./include/linux/bitmap.h:9,
                 from ./include/linux/cpumask.h:12,
                 from ./arch/x86/include/asm/cpumask.h:5,
                 from ./arch/x86/include/asm/msr.h:11,
                 from ./arch/x86/include/asm/processor.h:22,
                 from ./arch/x86/include/asm/cpufeature.h:5,
                 from ./arch/x86/include/asm/thread_info.h:53,
                 from ./include/linux/thread_info.h:60,
                 from ./arch/x86/include/asm/preempt.h:7,
                 from ./include/linux/preempt.h:78,
                 from ./include/linux/spinlock.h:55,
                 from ./include/linux/swait.h:7,
                 from ./include/linux/completion.h:12,
                 from drivers/iio/adc/stmpe-adc.c:10:
drivers/iio/adc/stmpe-adc.c: In function 'stmpe_adc_probe':
./include/linux/find.h:98:23: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'u32[1]' {aka 'unsigned int[1]'} [-Warray-bounds]
   98 |                 val = *addr | ~GENMASK(size - 1, offset);
      |                       ^~~~~
drivers/iio/adc/stmpe-adc.c:258:13: note: while referencing 'norequest_mask'
  258 |         u32 norequest_mask = 0;
      |             ^~~~~~~~~~~~~~

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Kees Cook 2021-12-15 15:25:13 -08:00 committed by Jonathan Cameron
parent 8a457852bc
commit 3511989cd2
1 changed files with 3 additions and 2 deletions
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5
drivers/iio/adc/stmpe-adc.c
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@ -256,6 +256,7 @@ static int stmpe_adc_probe(struct platform_device *pdev)
struct stmpe_adc *info;
struct device_node *np;
u32 norequest_mask = 0;
unsigned long bits;
int irq_temp, irq_adc;
int num_chan = 0;
int i = 0;
@ -309,8 +310,8 @@ static int stmpe_adc_probe(struct platform_device *pdev)
of_property_read_u32(np, "st,norequest-mask", &norequest_mask);
for_each_clear_bit(i, (unsigned long *) &norequest_mask,
(STMPE_ADC_LAST_NR + 1)) {
bits = norequest_mask;
for_each_clear_bit(i, &bits, (STMPE_ADC_LAST_NR + 1)) {
stmpe_adc_voltage_chan(&info->stmpe_adc_iio_channels[num_chan], i);
num_chan++;
}