linux-hardening - Coverity: nouveau_dp_irq(): Null pointer dereferences

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Date:   Thu, 10 Nov 2022 08:50:04 -0800
From:   coverity-bot <keescook@...omium.org>
To:     Lyude Paul <lyude@...hat.com>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org, Ilia Mirkin <imirkin@...m.mit.edu>,
        Daniel Vetter <daniel@...ll.ch>,
        Karol Herbst <kherbst@...hat.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...il.com>,
        "Nathan E. Egge" <unlord@...h.org>,
        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: nouveau_dp_irq(): Null pointer dereferences

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:

  Mon Aug 31 19:10:08 2020 -0400
    a0922278f83e ("drm/nouveau/kms/nv50-: Refactor and cleanup DP HPD handling")

Coverity reported the following:

*** CID 1527266:  Null pointer dereferences  (REVERSE_INULL)
drivers/gpu/drm/nouveau/nouveau_dp.c:237 in nouveau_dp_irq()
231     	struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP);
232     	struct nouveau_drm *drm = nouveau_drm(outp->base.base.dev);
233     	struct nv50_mstm *mstm;
234     	u64 hpd = 0;
235     	int ret;
236
vvv     CID 1527266:  Null pointer dereferences  (REVERSE_INULL)
vvv     Null-checking "outp" suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
237     	if (!outp)
238     		return;
239
240     	mstm = outp->dp.mstm;
241     	NV_DEBUG(drm, "service %s\n", connector->name);
242

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: 1527266 ("Null pointer dereferences")
Fixes: a0922278f83e ("drm/nouveau/kms/nv50-: Refactor and cleanup DP HPD handling")

Thanks for your attention!

-- 
Coverity-bot