drm/amdgpu: fix array out of bounds

commit 484f689fc9d4eb91c68f53e97dc355b1b06c3edb upstream.

When the initial value of i is greater than zero,
it may cause endless loop, resulting in array out
of bounds, fix it.

This is a port of the radeon fix to amdgpu.

Signed-off-by: tom will <os@iscas.ac.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/kv_dpm.c b/drivers/gpu/drm/amd/amdgpu/kv_dpm.c
index 7e9154c7f1dbbb7f9d3eee6791c0e4fcc835ea8d..d1c9525d81eb7b87f9e3aec8d016059424081a33 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/kv_dpm.c
+++ b/drivers/gpu/drm/amd/amdgpu/kv_dpm.c
@@ -2258,7 +2258,7 @@ static void kv_apply_state_adjust_rules(struct amdgpu_device *adev,
        if (pi->caps_stable_p_state) {
                stable_p_state_sclk = (max_limits->sclk * 75) / 100;
 
-               for (i = table->count - 1; i >= 0; i++) {
+               for (i = table->count - 1; i >= 0; i--) {
                        if (stable_p_state_sclk >= table->entries[i].clk) {
                                stable_p_state_sclk = table->entries[i].clk;
                                break;