This is a note to let you know that I've just added the patch titled
drm/amd/display: Check null pointers before using dc->clk_mgr
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-check-null-pointers-before-using-dc-.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit faa37acb135e01c7e3fff9d2736fd712b5d43fb3
Author: Alex Hung <alex.hung@xxxxxxx>
Date: Mon Jul 29 15:29:09 2024 -0600
drm/amd/display: Check null pointers before using dc->clk_mgr
[ Upstream commit 95d9e0803e51d5a24276b7643b244c7477daf463 ]
[WHY & HOW]
dc->clk_mgr is null checked previously in the same function, indicating
it might be null.
Passing "dc" to "dc->hwss.apply_idle_power_optimizations", which
dereferences null "dc->clk_mgr". (The function pointer resolves to
"dcn35_apply_idle_power_optimizations".)
This fixes 1 FORWARD_NULL issue reported by Coverity.
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@xxxxxxx>
Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
Signed-off-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 22dbc6bc21af4..db7a758ab778d 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -3671,7 +3671,8 @@ void dc_allow_idle_optimizations(struct dc *dc, bool allow)
if (allow == dc->idle_optimizations_allowed)
return;
- if (dc->hwss.apply_idle_power_optimizations && dc->hwss.apply_idle_power_optimizations(dc, allow))
+ if (dc->hwss.apply_idle_power_optimizations && dc->clk_mgr != NULL &&
+ dc->hwss.apply_idle_power_optimizations(dc, allow))
dc->idle_optimizations_allowed = allow;
}
