From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E912CC4332F for ; Mon, 12 Dec 2022 13:28:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232501AbiLLN2n (ORCPT ); Mon, 12 Dec 2022 08:28:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56480 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232459AbiLLN2T (ORCPT ); Mon, 12 Dec 2022 08:28:19 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 811102DDF for ; Mon, 12 Dec 2022 05:28:18 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 1E4BF61042 for ; Mon, 12 Dec 2022 13:28:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A7FE8C433D2; Mon, 12 Dec 2022 13:28:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670851697; bh=nupnXtc7ncuGc3Jm2eDVIPdn+8jfOEpmwmplLQm+k9U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IsJ/q0M9bGdzAytKJQ4a0GY1zPaIiZvdvEbjx5iBR7lN+JEoMjE1jUy6mjrMMyUsp WrOflh+qv1t+F+auUlXRaLxE7uqcE5JxeLiFambOTo1a6cxveBJneJGuZasPX56p+1 svhorKHSt0uMngQGyk8mtdzVtmy3NFzYd4WdNUXo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+c8ae65286134dd1b800d@syzkaller.appspotmail.com, Rob Clark , Daniel Vetter , Javier Martinez Canillas Subject: [PATCH 5.15 051/123] drm/shmem-helper: Remove errant put in error path Date: Mon, 12 Dec 2022 14:16:57 +0100 Message-Id: <20221212130929.070256109@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221212130926.811961601@linuxfoundation.org> References: <20221212130926.811961601@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Rob Clark commit 24013314be6ee4ee456114a671e9fa3461323de8 upstream. drm_gem_shmem_mmap() doesn't own this reference, resulting in the GEM object getting prematurely freed leading to a later use-after-free. Link: https://syzkaller.appspot.com/bug?extid=c8ae65286134dd1b800d Reported-by: syzbot+c8ae65286134dd1b800d@syzkaller.appspotmail.com Fixes: 2194a63a818d ("drm: Add library for shmem backed GEM objects") Cc: stable@vger.kernel.org Signed-off-by: Rob Clark Reviewed-by: Daniel Vetter Signed-off-by: Javier Martinez Canillas Link: https://patchwork.freedesktop.org/patch/msgid/20221130185748.357410-2-robdclark@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/drm_gem_shmem_helper.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -591,10 +591,8 @@ int drm_gem_shmem_mmap(struct drm_gem_sh } ret = drm_gem_shmem_get_pages(shmem); - if (ret) { - drm_gem_vm_close(vma); + if (ret) return ret; - } vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND; vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);