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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 54BF5C53200 for ; Wed, 29 Jul 2026 10:57:54 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C042C10E362; Wed, 29 Jul 2026 10:57:53 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="qXsalotL"; dkim-atps=neutral Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 80D4710E362 for ; Wed, 29 Jul 2026 10:57:49 +0000 (UTC) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 673C9414F9; Wed, 29 Jul 2026 10:57:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE2971F000E9; Wed, 29 Jul 2026 10:57:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1785322669; bh=QoUCRJ+Cuu4O+UuyRM21VyOyHnSW7QsYqiehOolOwzY=; h=Subject:To:Cc:From:Date; b=qXsalotL6khI6hNem/8WqgUiZeZNyXobpNKD/91gkTcYERrlpP7QhKFvWGz6yehCg OA3cuaUkVb4W3Fv7+qSZ+LtC+aqD1Y6npPx5rkSa2KiioXAwi+nYHFRy9WKKXQ4l0h iPHJcScdyCDknamNglLY3QxFGSf/nye1evYvjo/g= Subject: Patch "drm/sysfb: Avoid truncating maximum stride" has been added to the 6.18-stable tree To: dri-devel@lists.freedesktop.org, gregkh@linuxfoundation.org, javierm@redhat.com, sashiko-bot@kernel.org, tzimmermann@suse.de Cc: From: Date: Wed, 29 Jul 2026 12:56:45 +0200 Message-ID: <2026072945-lather-carmaker-b8ca@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit X-stable: commit X-Patchwork-Hint: ignore X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This is a note to let you know that I've just added the patch titled drm/sysfb: Avoid truncating maximum stride to the 6.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-sysfb-avoid-truncating-maximum-stride.patch and it can be found in the queue-6.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From 9206b22fb959f4a9cf1921f34aed0df1dcb1ab04 Mon Sep 17 00:00:00 2001 From: Thomas Zimmermann Date: Thu, 18 Jun 2026 10:42:00 +0200 Subject: drm/sysfb: Avoid truncating maximum stride From: Thomas Zimmermann commit 9206b22fb959f4a9cf1921f34aed0df1dcb1ab04 upstream. Passing a maximum as 64-bit type to drm_sysfb_get_validated_int0() can truncate the value to 32 bits. Use drm_sysfb_get_validated_size0(), which uses 64-bit arithmetics. Then test the returned stride against the limits of int to avoid truncations in the returned value. A valid stride is in the range of [1, INT_MAX] inclusive. Signed-off-by: Thomas Zimmermann Reported-by: Sashiko Closes: https://lore.kernel.org/dri-devel/20260617114016.5A5991F000E9@smtp.kernel.org/ Fixes: 32ae90c66fb6 ("drm/sysfb: Add efidrm for EFI displays") Fixes: a84eb6abe2b6 ("drm/sysfb: Add vesadrm for VESA displays") Cc: Thomas Zimmermann Cc: Javier Martinez Canillas Cc: dri-devel@lists.freedesktop.org Cc: # v6.16+ Reviewed-by: Javier Martinez Canillas Link: https://patch.msgid.link/20260618084327.46567-5-tzimmermann@suse.de Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/sysfb/drm_sysfb_screen_info.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/sysfb/drm_sysfb_screen_info.c +++ b/drivers/gpu/drm/sysfb/drm_sysfb_screen_info.c @@ -56,11 +56,17 @@ int drm_sysfb_get_stride_si(struct drm_d unsigned int width, unsigned int height, u64 size) { u64 lfb_linelength = si->lfb_linelength; + s64 stride; if (!lfb_linelength) lfb_linelength = drm_format_info_min_pitch(format, 0, width); - return drm_sysfb_get_validated_int0(dev, "stride", lfb_linelength, div64_u64(size, height)); + stride = drm_sysfb_get_validated_size0(dev, "stride", lfb_linelength, + div64_u64(size, height)); + if (stride < INT_MIN || stride > INT_MAX) + return -EINVAL; + + return (int)stride; /* stride or negative errno code */ } EXPORT_SYMBOL(drm_sysfb_get_stride_si); Patches currently in stable-queue which might be from tzimmermann@suse.de are queue-6.18/drm-tests-shmem-set-dma-mask-to-64-bit-in-drm_gem_sh.patch queue-6.18/drm-sysfb-avoid-possible-truncation-with-calculating-visible-size.patch queue-6.18/drm-sysfb-do-not-page-align-visible-size-of-the-framebuffer.patch queue-6.18/drm-sysfb-return-errno-code-from-drm_sysfb_get_visible_size.patch queue-6.18/drm-sysfb-avoid-truncating-maximum-stride.patch