From cf8b16857db702ceb8d52f9219a4613363e2b1cf Mon Sep 17 00:00:00 2001 From: Hersen Wu Date: Wed, 24 Apr 2024 16:15:15 -0400 Subject: [PATCH] drm/amd/display: Stop amdgpu_dm initialize when link nums greater than max_links [Why] Coverity report OVERRUN warning. There are only max_links elements within dc->links. link count could up to AMDGPU_DM_MAX_DISPLAY_INDEX 31. [How] Make sure link count less than max_links. Reviewed-by: Harry Wentland Acked-by: Tom Chung Signed-off-by: Hersen Wu Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index cce959302315..35bf77fe53af 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -4689,17 +4689,17 @@ static int amdgpu_dm_initialize_drm_device(struct amdgpu_device *adev) } } + if (link_cnt > MAX_LINKS) { + DRM_ERROR( + "KMS: Cannot support more than %d display indexes\n", + MAX_LINKS); + goto fail; + } + /* loops over all connectors on the board */ for (i = 0; i < link_cnt; i++) { struct dc_link *link = NULL; - if (i > AMDGPU_DM_MAX_DISPLAY_INDEX) { - DRM_ERROR( - "KMS: Cannot support more than %d display indexes\n", - AMDGPU_DM_MAX_DISPLAY_INDEX); - continue; - } - link = dc_get_link_at_index(dm->dc, i); if (link->connector_signal == SIGNAL_TYPE_VIRTUAL) { -- 2.50.1