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iio: sx9310: Fix access to variable DT array 

With the current code, we want to read 4 entries from DT array
"semtech,combined-sensors". If there are less, we silently fail as
of_property_read_u32_array() returns -EOVERFLOW.

First count the number of entries and if between 1 and 4, collect the
content of the array.

Fixes: 5b19ca2c78 ("iio: sx9310: Set various settings from DT")
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20210326184603.251683-2-gwendal@chromium.org
Cc: <stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Gwendal Grignou 2021-03-26 11:46:02 -07:00 committed by Jonathan Cameron
parent 194eafc9c1
commit 6f0078ae70
1 changed files with 29 additions and 13 deletions
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40
drivers/iio/proximity/sx9310.c
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@ -1213,17 +1213,17 @@ static int sx9310_init_compensation(struct iio_dev *indio_dev)
}
static const struct sx9310_reg_default *
sx9310_get_default_reg(struct sx9310_data *data, int i,
sx9310_get_default_reg(struct sx9310_data *data, int idx,
struct sx9310_reg_default *reg_def)
{
int ret;
const struct device_node *np = data->client->dev.of_node;
u32 combined[SX9310_NUM_CHANNELS] = { 4, 4, 4, 4 };
unsigned long comb_mask = 0;
const char *res;
u32 combined[SX9310_NUM_CHANNELS];
u32 start = 0, raw = 0, pos = 0;
unsigned long comb_mask = 0;
int ret, i, count;
const char *res;
memcpy(reg_def, &sx9310_default_regs[i], sizeof(*reg_def));
memcpy(reg_def, &sx9310_default_regs[idx], sizeof(*reg_def));
if (!np)
return reg_def;
@ -1234,15 +1234,31 @@ sx9310_get_default_reg(struct sx9310_data *data, int i,
reg_def->def |= SX9310_REG_PROX_CTRL2_SHIELDEN_GROUND;
}
reg_def->def &= ~SX9310_REG_PROX_CTRL2_COMBMODE_MASK;
of_property_read_u32_array(np, "semtech,combined-sensors",
combined, ARRAY_SIZE(combined));
for (i = 0; i < ARRAY_SIZE(combined); i++) {
if (combined[i] <= SX9310_NUM_CHANNELS)
count = of_property_count_elems_of_size(np, "semtech,combined-sensors",
sizeof(u32));
if (count > 0 && count <= ARRAY_SIZE(combined)) {
ret = of_property_read_u32_array(np, "semtech,combined-sensors",
combined, count);
if (ret)
break;
} else {
/*
* Either the property does not exist in the DT or the
* number of entries is incorrect.
*/
break;
}
for (i = 0; i < count; i++) {
if (combined[i] >= SX9310_NUM_CHANNELS) {
/* Invalid sensor (invalid DT). */
break;
}
comb_mask |= BIT(combined[i]);
}
if (i < count)
break;
comb_mask &= 0xf;
reg_def->def &= ~SX9310_REG_PROX_CTRL2_COMBMODE_MASK;
if (comb_mask == (BIT(3) | BIT(2) | BIT(1) | BIT(0)))
reg_def->def |= SX9310_REG_PROX_CTRL2_COMBMODE_CS0_CS1_CS2_CS3;
else if (comb_mask == (BIT(1) | BIT(2)))