From: Sung-huai Wang Date: Tue, 6 Jun 2023 06:28:38 +0000 (+0800) Subject: drm/amd/display: add a NULL pointer check X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=0f48a4b83610cb0e4e0bc487800ab69f51b4aca6;p=linux.git drm/amd/display: add a NULL pointer check [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 Acked-by: Hamza Mahfooz Signed-off-by: Sung-huai Wang Signed-off-by: Alex Deucher --- 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 8088558861836..e115ff91aaaae 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;