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[96.230.100.15]) by smtp.gmail.com with ESMTPSA id p70sm7253061qka.62.2022.02.08.12.09.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Feb 2022 12:09:16 -0800 (PST) Message-ID: <58cc03e21bdf8665f402c7eb9beed557f19a4be2.camel@redhat.com> Subject: Re: [PATCH][next] nouveau/svm: Use struct_size() helper in nouveau_pfns_map() From: Lyude Paul To: "Gustavo A. R. Silva" , Ben Skeggs , Karol Herbst , David Airlie , Daniel Vetter Cc: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Date: Tue, 08 Feb 2022 15:09:04 -0500 In-Reply-To: <20220207233923.GA524723@embeddedor> References: <20220207233923.GA524723@embeddedor> Organization: Red Hat Inc. Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.3 (3.42.3-1.fc35) MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Reviewed-by: Lyude Paul Will push this to drm-misc-next, thanks! On Mon, 2022-02-07 at 17:39 -0600, Gustavo A. R. Silva wrote: > Make use of the struct_size() helper instead of an open-coded version, > in order to avoid any potential type mistakes or integer overflows that, > in the worse scenario, could lead to heap overflows. > > Link: https://github.com/KSPP/linux/issues/160 > Signed-off-by: Gustavo A. R. Silva > --- >  drivers/gpu/drm/nouveau/nouveau_svm.c | 4 ++-- >  1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c > b/drivers/gpu/drm/nouveau/nouveau_svm.c > index 266809e511e2..46a5a1016e37 100644 > --- a/drivers/gpu/drm/nouveau/nouveau_svm.c > +++ b/drivers/gpu/drm/nouveau/nouveau_svm.c > @@ -925,8 +925,8 @@ nouveau_pfns_map(struct nouveau_svmm *svmm, struct > mm_struct *mm, >   >         mutex_lock(&svmm->mutex); >   > -       ret = nvif_object_ioctl(&svmm->vmm->vmm.object, args, sizeof(*args) > + > -                               npages * sizeof(args->p.phys[0]), NULL); > +       ret = nvif_object_ioctl(&svmm->vmm->vmm.object, args, > +                               struct_size(args, p.phys, npages), NULL); >   >         mutex_unlock(&svmm->mutex); >  } -- Cheers, Lyude Paul (she/her) Software Engineer at Red Hat