From patchwork Tue Oct 27 13:48:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 289679 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E7F6C64E69 for ; Tue, 27 Oct 2020 15:43:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3160B2242F for ; Tue, 27 Oct 2020 15:43:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603813413; bh=JZO0FMmtG4vn/Ir8BKBtAao/jx/uemYfhrNZ6ukyQ5c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Rho5CyYc7WtYDEoGISCRwa9qNibhttliu7P6VBTF0+YyJGGypLNzSF6nvYhUc8RVu X2CGFuVc1YSgbzQ2hrIXwsf6Fga9XHgc0EimzGSqAKLZ65o5K1SqjcZZp1Eb5shXRN E/p9ZvbWMEv2d0QsP7VXU7k5hxhLPMkXliSSkXyU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1799292AbgJ0Pap (ORCPT ); Tue, 27 Oct 2020 11:30:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:47562 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1799286AbgJ0Pan (ORCPT ); Tue, 27 Oct 2020 11:30:43 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 159D222264; Tue, 27 Oct 2020 15:30:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603812642; bh=JZO0FMmtG4vn/Ir8BKBtAao/jx/uemYfhrNZ6ukyQ5c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ia+q8Fhs+Lqh7lkqXPr/llXSXHsvdGmauI/ASKGUS5dvF4wmo21t67aacVvAB243L gBoqsbBQ0BwkzMuu+WlD0314HJmt77GPJveSUeyUt35CTycn+4vd89SVNKDsGnJuDV eiXm/TPKOesY3pvEJ4aK6NTPquibwhdHxEAca6n4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tom Rix , Thomas Winischhofer , Andrew Morton , Bartlomiej Zolnierkiewicz , Sasha Levin Subject: [PATCH 5.9 240/757] video: fbdev: sis: fix null ptr dereference Date: Tue, 27 Oct 2020 14:48:10 +0100 Message-Id: <20201027135501.851259442@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135450.497324313@linuxfoundation.org> References: <20201027135450.497324313@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Tom Rix [ Upstream commit ad6f93e9cd56f0b10e9b22e3e137d17a1a035242 ] Clang static analysis reports this representative error init.c:2501:18: warning: Array access (from variable 'queuedata') results in a null pointer dereference templ |= ((queuedata[i] & 0xc0) << 3); This is the problem block of code if(ModeNo > 0x13) { ... if(SiS_Pr->ChipType == SIS_730) { queuedata = &FQBQData730[0]; } else { queuedata = &FQBQData[0]; } } else { } queuedata is not set in the else block Reviewing the old code, the arrays FQBQData730 and FQBQData were used directly. So hoist the setting of queuedata out of the if-else block. Fixes: 544393fe584d ("[PATCH] sisfb update") Signed-off-by: Tom Rix Cc: Thomas Winischhofer Cc: Andrew Morton Signed-off-by: Bartlomiej Zolnierkiewicz Link: https://patchwork.freedesktop.org/patch/msgid/20200805145208.17727-1-trix@redhat.com Signed-off-by: Sasha Levin --- drivers/video/fbdev/sis/init.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/video/fbdev/sis/init.c b/drivers/video/fbdev/sis/init.c index dfe3eb769638b..fde27feae5d0c 100644 --- a/drivers/video/fbdev/sis/init.c +++ b/drivers/video/fbdev/sis/init.c @@ -2428,6 +2428,11 @@ SiS_SetCRT1FIFO_630(struct SiS_Private *SiS_Pr, unsigned short ModeNo, i = 0; + if (SiS_Pr->ChipType == SIS_730) + queuedata = &FQBQData730[0]; + else + queuedata = &FQBQData[0]; + if(ModeNo > 0x13) { /* Get VCLK */ @@ -2445,12 +2450,6 @@ SiS_SetCRT1FIFO_630(struct SiS_Private *SiS_Pr, unsigned short ModeNo, /* Get half colordepth */ colorth = colortharray[(SiS_Pr->SiS_ModeType - ModeEGA)]; - if(SiS_Pr->ChipType == SIS_730) { - queuedata = &FQBQData730[0]; - } else { - queuedata = &FQBQData[0]; - } - do { templ = SiS_CalcDelay2(SiS_Pr, queuedata[i]) * VCLK * colorth;