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drm/amd/display: Check gpio_id before used as array index

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[ Upstream commit 2a5626eeb3 ]

[WHY & HOW]
GPIO_ID_UNKNOWN (-1) is not a valid value for array index and therefore
should be checked in advance.

This fixes 5 OVERRUN issues reported by Coverity.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alex Hung 2024-04-16 16:40:00 -06:00 committed by Greg Kroah-Hartman
parent 30e60db429
commit 08e7755f75
1 changed files with 11 additions and 2 deletions
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13
drivers/gpu/drm/amd/display/dc/gpio/gpio_service.c
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@ -239,6 +239,9 @@ static bool is_pin_busy(
enum gpio_id id,
uint32_t en)
{
if (id == GPIO_ID_UNKNOWN)
return false;
return service->busyness[id][en];
}
@ -247,6 +250,9 @@ static void set_pin_busy(
enum gpio_id id,
uint32_t en)
{
if (id == GPIO_ID_UNKNOWN)
return;
service->busyness[id][en] = true;
}
@ -255,6 +261,9 @@ static void set_pin_free(
enum gpio_id id,
uint32_t en)
{
if (id == GPIO_ID_UNKNOWN)
return;
service->busyness[id][en] = false;
}
@ -263,7 +272,7 @@ enum gpio_result dal_gpio_service_lock(
enum gpio_id id,
uint32_t en)
{
if (!service->busyness[id]) {
if (id != GPIO_ID_UNKNOWN && !service->busyness[id]) {
ASSERT_CRITICAL(false);
return GPIO_RESULT_OPEN_FAILED;
}
@ -277,7 +286,7 @@ enum gpio_result dal_gpio_service_unlock(
enum gpio_id id,
uint32_t en)
{
if (!service->busyness[id]) {
if (id != GPIO_ID_UNKNOWN && !service->busyness[id]) {
ASSERT_CRITICAL(false);
return GPIO_RESULT_OPEN_FAILED;
}