From: Alex Hung <alex.hung@amd.com> mainline inclusion from mainline-v6.12-rc1 commit d925c04d974c657d10471c0c2dba3bc9c7d994ee category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYPKL CVE: CVE-2024-47704 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [WHAT & HOW] Functions dp_enable_link_phy and dp_disable_link_phy can pass link_res without initializing hpo_dp_link_enc and it is necessary to check for null before dereferencing. This fixes 1 FORWARD_NULL issue reported by Coverity. Fixes: 0beca868cde8 ("drm/amd/display: Check link_res->hpo_dp_link_enc before using it") Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com> Signed-off-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Jinjiang Tu <tujinjiang@huawei.com> --- drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c b/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c index d0148f10dfc0..cec68c5dba13 100644 --- a/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c +++ b/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c @@ -110,6 +110,11 @@ void enable_hpo_dp_link_output(struct dc_link *link, enum clock_source_id clock_source, const struct dc_link_settings *link_settings) { + if (!link_res->hpo_dp_link_enc) { + DC_LOG_ERROR("%s: invalid hpo_dp_link_enc\n", __func__); + return; + } + if (link->dc->res_pool->dccg->funcs->set_symclk32_le_root_clock_gating) link->dc->res_pool->dccg->funcs->set_symclk32_le_root_clock_gating( link->dc->res_pool->dccg, -- 2.34.1