linux-hardening - Coverity: nv50_pior_atomic_enable(): Memory

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Date:   Thu, 10 Nov 2022 08:48:48 -0800
From:   coverity-bot <keescook@...omium.org>
To:     Ben Skeggs <bskeggs@...hat.com>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
        Lyude Paul <lyude@...hat.com>,
        Karol Herbst <kherbst@...hat.com>,
        David Airlie <airlied@...il.com>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...el.com>,
        Dave Airlie <airlied@...hat.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-next@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Coverity: nv50_pior_atomic_enable(): Memory - corruptions

Hello!

This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20221110 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:

  Wed Nov 9 08:22:02 2022 +1000
    813443721331 ("drm/nouveau/disp: move DP link config into acquire")

Coverity reported the following:

*** CID 1527268:  Memory - corruptions  (OVERRUN)
drivers/gpu/drm/nouveau/dispnv50/disp.c:1817 in nv50_pior_atomic_enable()
1811     	case DCB_OUTPUT_TMDS:
1812     		ctrl |= NVDEF(NV507D, PIOR_SET_CONTROL, PROTOCOL, EXT_TMDS_ENC);
1813     		nvif_outp_acquire_tmds(&nv_encoder->outp, false, false, 0, 0, 0, false);
1814     		break;
1815     	case DCB_OUTPUT_DP:
1816     		ctrl |= NVDEF(NV507D, PIOR_SET_CONTROL, PROTOCOL, EXT_TMDS_ENC);
vvv     CID 1527268:  Memory - corruptions  (OVERRUN)
vvv     Overrunning array "(*nv_encoder).dp.dpcd" of 15 bytes by passing it to a function which accesses it at byte offset 15.
1817     		nvif_outp_acquire_dp(&nv_encoder->outp, nv_encoder->dp.dpcd, 0, 0, false, false);
1818     		break;
1819     	default:
1820     		BUG();
1821     		break;
1822     	}

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: 1527268 ("Memory - corruptions")
Fixes: 813443721331 ("drm/nouveau/disp: move DP link config into acquire")

Thanks for your attention!

-- 
Coverity-bot