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 91737C25B06 for ; Sun, 14 Aug 2022 16:42:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240059AbiHNQmy (ORCPT ); Sun, 14 Aug 2022 12:42:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242921AbiHNQkK (ORCPT ); Sun, 14 Aug 2022 12:40:10 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 093852705; Sun, 14 Aug 2022 09:30:38 -0700 (PDT) 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 ams.source.kernel.org (Postfix) with ESMTPS id 38A0BB80B37; Sun, 14 Aug 2022 16:30:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1ADF8C433C1; Sun, 14 Aug 2022 16:30:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660494636; bh=QJRKZeqWyHOAMgpIQr673Jjz8RQb1Y0LVJw0ylK1rRM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DBXtui74Wlr8KyiWwcxMOVjEM7QHTxAe4VqRsrVCnlvGptoHJYGNpNOC/TgklIukv EjZTcBH6NLTUJ/jBJBSVmFf4bj+pigUPIXvYkdD3mqcfaG2fDGumpSvo+2Kp/BvP+U hhwDW/x13U7UJ1r+w9aubBLbKnvAQGQx6zc47UiXT+maEgCzTWUOmEA18alVrkdtdZ 4SOhxC4+rr8dCGZhC10S1CkwMDnvMKQKvzSe2aT8AYCYNYsI9qFtilUqZkU/CjPdaz LFv9o7R5HNijKjKaizoap+tvLDWR6h2kG9awEW3lJkEDz/dVawE09BbbP03GXTgqf7 5VcDHJxEHGD2w== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zheyu Ma , Helge Deller , Sasha Levin , linux@zary.sk, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 4.14 8/9] video: fbdev: i740fb: Check the argument of i740_calc_vclk() Date: Sun, 14 Aug 2022 12:29:58 -0400 Message-Id: <20220814162959.2399011-8-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220814162959.2399011-1-sashal@kernel.org> References: <20220814162959.2399011-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zheyu Ma [ Upstream commit 40bf722f8064f50200b8c4f8946cd625b441dda9 ] Since the user can control the arguments of the ioctl() from the user space, under special arguments that may result in a divide-by-zero bug. If the user provides an improper 'pixclock' value that makes the argumet of i740_calc_vclk() less than 'I740_RFREQ_FIX', it will cause a divide-by-zero bug in: drivers/video/fbdev/i740fb.c:353 p_best = min(15, ilog2(I740_MAX_VCO_FREQ / (freq / I740_RFREQ_FIX))); The following log can reveal it: divide error: 0000 [#1] PREEMPT SMP KASAN PTI RIP: 0010:i740_calc_vclk drivers/video/fbdev/i740fb.c:353 [inline] RIP: 0010:i740fb_decode_var drivers/video/fbdev/i740fb.c:646 [inline] RIP: 0010:i740fb_set_par+0x163f/0x3b70 drivers/video/fbdev/i740fb.c:742 Call Trace: fb_set_var+0x604/0xeb0 drivers/video/fbdev/core/fbmem.c:1034 do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189 Fix this by checking the argument of i740_calc_vclk() first. Signed-off-by: Zheyu Ma Signed-off-by: Helge Deller Signed-off-by: Sasha Levin --- drivers/video/fbdev/i740fb.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/i740fb.c b/drivers/video/fbdev/i740fb.c index 7bc5f6056c77..4147a9534179 100644 --- a/drivers/video/fbdev/i740fb.c +++ b/drivers/video/fbdev/i740fb.c @@ -399,7 +399,7 @@ static int i740fb_decode_var(const struct fb_var_screeninfo *var, u32 xres, right, hslen, left, xtotal; u32 yres, lower, vslen, upper, ytotal; u32 vxres, xoffset, vyres, yoffset; - u32 bpp, base, dacspeed24, mem; + u32 bpp, base, dacspeed24, mem, freq; u8 r7; int i; @@ -641,7 +641,12 @@ static int i740fb_decode_var(const struct fb_var_screeninfo *var, par->atc[VGA_ATC_OVERSCAN] = 0; /* Calculate VCLK that most closely matches the requested dot clock */ - i740_calc_vclk((((u32)1e9) / var->pixclock) * (u32)(1e3), par); + freq = (((u32)1e9) / var->pixclock) * (u32)(1e3); + if (freq < I740_RFREQ_FIX) { + fb_dbg(info, "invalid pixclock\n"); + freq = I740_RFREQ_FIX; + } + i740_calc_vclk(freq, par); /* Since we program the clocks ourselves, always use VCLK2. */ par->misc |= 0x0C; -- 2.35.1