From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E5B2343B6D1; Thu, 30 Jul 2026 14:37:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785422261; cv=none; b=ozqqD0PbLSzM3zMGYsBvXkRKkA+OzNUtGZaIaA/ycB7JOpIrfHNrTzTtvnbxdNs+kiGGBR/P1OLh5ts2RbjZO0iIUON1fFbYbBmCL9f4VJ6vkXMxAsKnR9i2w1hxMjo6AuMocWGYpieoZmBlDSFOeic47Y2HTk4/BZI/BqvyXkk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785422261; c=relaxed/simple; bh=JauKDFkMPh09nsBNXLflOWcdqvnLTXoOjoz8zryrrPI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sAcRLiCaXHnTqJjj7VfSrBZYOWSc16pxLYnl3VeUHNsIlH6DvaN2+4TrFE1+Zdm5yjEonYGxbMf4n/ifjzYtsxPasozmL5WjtBz95pMYy5dLeymxAmw3gxfEGi3rezOybKiEOa0yH04C94xG/JQXEABH/dej4l+HoWI1lgypVOs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=MXcPswhJ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="MXcPswhJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 397081F000E9; Thu, 30 Jul 2026 14:37:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1785422259; bh=vXfoV7s+buFtfmsDqlaZbxjHaRInprpggMemb9fpdMA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=MXcPswhJu0llv5Yer9Y5K4oqBBo1UUOS+waND1gAdY/lznx56DntGbFgD1DM2YFT8 OlJsuorWYd42YTklPFd3G89vvu2KZ5yjE2ChzOHpUkFqhTOxutWkGcsK9kftvGr/u0 8XsX/2erIEG7xeJKpIvqz139oBGNuFKE9tmRcFzE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Thomas Zimmermann , Sashiko , Javier Martinez Canillas , dri-devel@lists.freedesktop.org Subject: [PATCH 7.1 379/744] drm/sysfb: Avoid truncating maximum stride Date: Thu, 30 Jul 2026 16:10:52 +0200 Message-ID: <20260730141452.342356347@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260730141444.267951807@linuxfoundation.org> References: <20260730141444.267951807@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.1-stable review patch. If anyone has any objections, please let me know. ------------------ 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);