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power: regulator: gpio-regulator: protect count value

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Update the size of states_array to avoid overflow for
dev_pdata->voltages[j] and dev_pdata->states[j].

As the size of array is GPIO_REGULATOR_MAX_STATES, the size of
states_array is limited by GPIO_REGULATOR_MAX_STATES * 2 = 4
instead of 8 previously.

The value of the "count" variable is limited by the third parameter of
fdtdec_get_int_array_count.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Patrick Delaunay 2020-09-10 18:18:16 +02:00 committed by Tom Rini
parent 86eeac7bcf
commit 2d69b08618
1 changed files with 3 additions and 2 deletions
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5
drivers/power/regulator/gpio-regulator.c
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@ -35,7 +35,7 @@ static int gpio_regulator_ofdata_to_platdata(struct udevice *dev)
const void *blob = gd->fdt_blob;
int node = dev_of_offset(dev);
int ret, count, i, j;
u32 states_array[8];
u32 states_array[GPIO_REGULATOR_MAX_STATES * 2];
dev_pdata = dev_get_platdata(dev);
uc_pdata = dev_get_uclass_platdata(dev);
@ -58,7 +58,8 @@ static int gpio_regulator_ofdata_to_platdata(struct udevice *dev)
debug("regulator gpio - not found! Error: %d", ret);
count = fdtdec_get_int_array_count(blob, node, "states",
states_array, 8);
states_array,
ARRAY_SIZE(states_array));
if (!count)
return -EINVAL;