From: Sung-huai Wang danny.wang@amd.com

[Why & How]

We have to check if stream is properly initialized before calling find_matching_pll(), otherwise we might end up trying to deferecence a NULL pointer.

Cc: stable@vger.kernel.org # 6.1+ Reviewed-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com Acked-by: Hamza Mahfooz hamza.mahfooz@amd.com Signed-off-by: Sung-huai Wang danny.wang@amd.com --- .../gpu/drm/amd/display/dc/dce112/dce112_resource.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c b/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c index 808855886183..e115ff91aaaa 100644 --- a/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c +++ b/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c @@ -974,10 +974,12 @@ enum dc_status resource_map_phy_clock_resources( || dc_is_virtual_signal(pipe_ctx->stream->signal)) pipe_ctx->clock_source = dc->res_pool->dp_clock_source; - else - pipe_ctx->clock_source = find_matching_pll( - &context->res_ctx, dc->res_pool, - stream); + else { + if (stream && stream->link && stream->link->link_enc) + pipe_ctx->clock_source = find_matching_pll( + &context->res_ctx, dc->res_pool, + stream); + }

if (pipe_ctx->clock_source == NULL) return DC_NO_CLOCK_SOURCE_RESOURCE;