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pinctrl: tegra20: detect unknown/invalid pin/func configurations

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Tegra20 driver doesn't know about some pin configurations and even about
some pins. In case when pin configuration is unknown the pin would be
muxed to whatever is under function 0, in case when pin itself is
unknown, it could cause out-of-bounds array access in pinmux_set_func
and pinmux_set_pullupdown.

Signed-off-by: Artur Kowalski <arturkow2000@gmail.com>
Reviewed-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
This commit is contained in:
Artur Kowalski 2025-03-30 21:11:54 +02:00 • committed by Svyatoslav Ryhel
parent 645350ed4b
commit a35bf832d7
1 changed files with 16 additions and 2 deletions
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18
drivers/pinctrl/tegra/pinctrl-tegra20.c
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@ -37,6 +37,11 @@ static void tegra_pinctrl_set_pin(struct udevice *config)
if (!strcmp(pins[i], tegra_pinctrl_to_pingrp[pin_id]))
break;
if (pin_id == PMUX_PINGRP_COUNT) {
log_debug("%s: %s(%d) is not valid\n", __func__, pins[i], pin_id);
continue;
}
if (pull >= 0)
pinmux_set_pullupdown(pin_id, pull);
@ -58,13 +63,16 @@ static void tegra_pinctrl_set_func(struct udevice *config)
const char **pins;
function = dev_read_string(config, "nvidia,function");
if (function)
if (function) {
for (i = 0; i < PMUX_FUNC_COUNT; i++)
if (tegra_pinctrl_to_func[i])
if (!strcmp(function, tegra_pinctrl_to_func[i]))
break;
func_id = i;
func_id = i;
} else {
func_id = PMUX_FUNC_COUNT;
}
count = dev_read_string_list(config, "nvidia,pins", &pins);
if (count < 0) {
@ -78,6 +86,12 @@ static void tegra_pinctrl_set_func(struct udevice *config)
if (!strcmp(pins[i], tegra_pinctrl_to_pingrp[pin_id]))
break;
if (func_id == PMUX_FUNC_COUNT || pin_id == PMUX_PINGRP_COUNT) {
log_debug("%s: pin %s(%d) or function %s(%d) is not valid\n",
__func__, pins[i], pin_id, function, func_id);
continue;
}
debug("%s(%d) muxed to %s(%d)\n", pins[i], pin_id, function, func_id);
pinmux_set_func(pin_id, func_id);