linux-kernel - Coverity: pre_compute_mst_dsc_configs_for

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Date:   Fri, 18 Nov 2022 08:50:35 -0800
From:   coverity-bot <keescook@...omium.org>
To:     Lyude Paul <lyude@...hat.com>
Cc:     David Airlie <airlied@...il.com>, Fangzhi Zuo <Jerry.Zuo@....com>,
        Harry Wentland <harry.wentland@....com>,
        Christian König <christian.koenig@....com>,
        Wayne Lin <Wayne.Lin@....com>, stable@...r.kernel.org,
        #v5.6+@...nel, linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Roman Li <roman.li@....com>, amd-gfx@...ts.freedesktop.org,
        Daniel Wheeler <daniel.wheeler@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        hersen wu <hersenxs.wu@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        dri-devel@...ts.freedesktop.org,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        Hamza Mahfooz <hamza.mahfooz@....com>,
        Alex Hung <alex.hung@....com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-next@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Coverity: pre_compute_mst_dsc_configs_for_state(): Uninitialized
 variables

Hello!

This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20221118 as part of the linux-next scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan

You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by commits:

  Thu Nov 17 00:18:25 2022 -0500
    7cce4cd628be ("drm/amdgpu/mst: Stop ignoring error codes and deadlocking")

Coverity reported the following:

*** CID 1527373:  Uninitialized variables  (UNINIT)
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c:1227 in pre_compute_mst_dsc_configs_for_state()
1221     		for (j = 0; j < dc_state->stream_count; j++) {
1222     			if (dc_state->streams[j]->link == stream->link)
1223     				computed_streams[j] = true;
1224     		}
1225     	}
1226
vvv     CID 1527373:  Uninitialized variables  (UNINIT)
vvv     Using uninitialized value "ret".
1227     	return ret;
1228     }
1229
1230     static int find_crtc_index_in_state_by_stream(struct drm_atomic_state *state,
1231     					      struct dc_stream_state *stream)
1232     {

If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):

Reported-by: coverity-bot <keescook+coverity-bot@...omium.org>
Addresses-Coverity-ID: 1527373 ("Uninitialized variables")
Fixes: 7cce4cd628be ("drm/amdgpu/mst: Stop ignoring error codes and deadlocking")

If dc_state->stream_count is 0, "ret" is undefined. Perhaps initialize
it as -EINVAL?

Thanks for your attention!

-- 
Coverity-bot