Patch "drm/amd/display: Avoid NULL dereference of timing generator" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/amd/display: Avoid NULL dereference of timing generator

to the 6.6-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-avoid-null-dereference-of-timing-gen.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 8c59f785a6540871659a54be9b0e6527b8d5e3dd
Author: Wayne Lin <wayne.lin@xxxxxxx>
Date:   Fri Sep 8 10:14:49 2023 +0800

    drm/amd/display: Avoid NULL dereference of timing generator
    
    [ Upstream commit b1904ed480cee3f9f4036ea0e36d139cb5fee2d6 ]
    
    [Why & How]
    Check whether assigned timing generator is NULL or not before
    accessing its funcs to prevent NULL dereference.
    
    Reviewed-by: Jun Lei <jun.lei@xxxxxxx>
    Acked-by: Hersen Wu <hersenxs.wu@xxxxxxx>
    Signed-off-by: Wayne Lin <wayne.lin@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_stream.c b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
index 01fe2d2fd2417..ebe571fcefe32 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -582,7 +582,7 @@ uint32_t dc_stream_get_vblank_counter(const struct dc_stream_state *stream)
 	for (i = 0; i < MAX_PIPES; i++) {
 		struct timing_generator *tg = res_ctx->pipe_ctx[i].stream_res.tg;
 
-		if (res_ctx->pipe_ctx[i].stream != stream)
+		if (res_ctx->pipe_ctx[i].stream != stream || !tg)
 			continue;
 
 		return tg->funcs->get_frame_count(tg);
@@ -641,7 +641,7 @@ bool dc_stream_get_scanoutpos(const struct dc_stream_state *stream,
 	for (i = 0; i < MAX_PIPES; i++) {
 		struct timing_generator *tg = res_ctx->pipe_ctx[i].stream_res.tg;
 
-		if (res_ctx->pipe_ctx[i].stream != stream)
+		if (res_ctx->pipe_ctx[i].stream != stream || !tg)
 			continue;
 
 		tg->funcs->get_scanoutpos(tg,



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