Reviewed-by: Tom Chung <chiahsuan.chung@xxxxxxx>
On 2/15/2024 9:31 PM, Srinivasan
Shanmugam wrote:
In the first if statement, we're checking if 'replay' is NULL. But in
the second if statement, we're not checking if 'replay' is NULL again
before calling replay->funcs->replay_set_power_opt().
if (replay == NULL && force_static)
return false;
...
if (link->replay_settings.replay_feature_enabled &&
replay->funcs->replay_set_power_opt) {
replay->funcs->replay_set_power_opt(replay, *power_opts, panel_inst);
link->replay_settings.replay_power_opt_active = *power_opts;
}
If 'replay' is NULL, this will cause a null pointer dereference.
Fixes the below found by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/link/protocols/link_edp_panel_control.c:895 edp_set_replay_allow_active() error: we previously assumed 'replay' could be null (see line 887)
Fixes: c7ddc0a800bc ("drm/amd/display: Add Functions to enable Freesync Panel Replay")
Cc: Bhawanpreet Lakha <Bhawanpreet.Lakha@xxxxxxx>
Cc: Roman Li <roman.li@xxxxxxx>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Cc: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Cc: Tom Chung <chiahsuan.chung@xxxxxxx>
Suggested-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
---
.../drm/amd/display/dc/link/protocols/link_edp_panel_control.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
index 443215b96308..acfbbc638cc6 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
@@ -892,7 +892,8 @@ bool edp_set_replay_allow_active(struct dc_link *link, const bool *allow_active,
/* Set power optimization flag */
if (power_opts && link->replay_settings.replay_power_opt_active != *power_opts) {
- if (link->replay_settings.replay_feature_enabled && replay->funcs->replay_set_power_opt) {
+ if (replay != NULL && link->replay_settings.replay_feature_enabled &&
+ replay->funcs->replay_set_power_opt) {
replay->funcs->replay_set_power_opt(replay, *power_opts, panel_inst);
link->replay_settings.replay_power_opt_active = *power_opts;
}
