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[156.34.48.30]) by smtp.gmail.com with ESMTPSA id s15sm6329516qkj.21.2020.10.09.08.14.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2020 08:14:19 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kQu66-0020X4-DL; Fri, 09 Oct 2020 12:14:18 -0300 Date: Fri, 9 Oct 2020 12:14:18 -0300 From: Jason Gunthorpe To: Christian =?utf-8?B?S8O2bmln?= Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, chris@chris-wilson.co.uk, airlied@redhat.com, akpm@linux-foundation.org, daniel@ffwll.ch, sumit.semwal@linaro.org, willy@infradead.org, jhubbard@nvidia.com Subject: Re: [PATCH 2/6] mm: introduce vma_set_file function v3 Message-ID: <20201009151418.GW5177@ziepe.ca> References: <20201009150342.1979-1-christian.koenig@amd.com> <20201009150342.1979-2-christian.koenig@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20201009150342.1979-2-christian.koenig@amd.com> Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Oct 09, 2020 at 05:03:38PM +0200, Christian K=C3=B6nig wrote: > +/* > + * Change backing file, only valid to use during initial VMA setup. > + */ > +void vma_set_file(struct vm_area_struct *vma, struct file *file) > +{ > + if (file) > + get_file(file); > + > + swap(vma->vm_file, file); > + > + if (file) > + fput(file); > +} fput crashes when file is NULL so the error handling after unmap_and_free_vma: can't handle this case, similarly vm_file can't be NULL either. So just simply: swap(vma->vm_file, file); get_file(vma->vm_file); fput(file); =20 Will do? Just let it crash if any of them are wrongly NULL. Jason