From: Nikita Zhandarovich Date: Fri, 29 May 2026 14:57:58 +0000 (+0300) Subject: drm/i915/edp: Check supported link rates DPCD read X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=2673cefa99ca918e7ac5b0388ff578a83656c896;p=thirdparty%2Flinux.git drm/i915/edp: Check supported link rates DPCD read intel_edp_set_sink_rates() reads DP_SUPPORTED_LINK_RATES into a local stack array and then parses the array unconditionally. If the read fails, the array contents are not valid and may result in bogus sink link rates being used. Use drm_dp_dpcd_read_data() and clear the sink rate array on failure, so the existing parser falls back to the default sink rate handling. Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE. Fixes: 68f357cb7347 ("drm/i915/dp: generate and cache sink rate array for all DP, not just eDP 1.4") Signed-off-by: Nikita Zhandarovich Reviewed-by: Jani Nikula Link: https://patch.msgid.link/20260529145759.1640646-1-n.zhandarovich@fintech.ru Signed-off-by: Jani Nikula (cherry picked from commit bd61c7756b34157e093028225a69383b4b1203cc) Signed-off-by: Tvrtko Ursulin --- diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 6ef2a0043cda..5c3e816b0135 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -4678,10 +4678,17 @@ intel_edp_set_sink_rates(struct intel_dp *intel_dp) if (intel_dp->edp_dpcd[0] >= DP_EDP_14) { __le16 sink_rates[DP_MAX_SUPPORTED_RATES]; + int ret; int i; - drm_dp_dpcd_read(&intel_dp->aux, DP_SUPPORTED_LINK_RATES, - sink_rates, sizeof(sink_rates)); + ret = drm_dp_dpcd_read_data(&intel_dp->aux, + DP_SUPPORTED_LINK_RATES, + sink_rates, sizeof(sink_rates)); + if (ret < 0) { + drm_dbg_kms(display->drm, + "Unable to read eDP supported link rates, using default rates\n"); + memset(sink_rates, 0, sizeof(sink_rates)); + } for (i = 0; i < ARRAY_SIZE(sink_rates); i++) { int rate;