From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56737) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fXjNl-0001TG-1W for qemu-devel@nongnu.org; Tue, 26 Jun 2018 04:31:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fXjNh-0003vK-Pr for qemu-devel@nongnu.org; Tue, 26 Jun 2018 04:31:25 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:39922 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fXjNh-0003v5-LN for qemu-devel@nongnu.org; Tue, 26 Jun 2018 04:31:21 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4360E83207 for ; Tue, 26 Jun 2018 08:31:21 +0000 (UTC) From: Gerd Hoffmann Date: Tue, 26 Jun 2018 10:31:19 +0200 Message-Id: <20180626083120.19515-1-kraxel@redhat.com> Subject: [Qemu-devel] [PATCH] ramfb: fix overflow List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Gerd Hoffmann > CID 1393621: (OVERFLOW_BEFORE_WIDEN) > Potentially overflowing expression "stride * s->height" with type "unsigned > int" (32 bits, unsigned) is evaluated using +32-bit arithmetic, and then used > in a context that expects an expression of type "hwaddr" (64 bits, unsigned). Fix by changing stride from uint32_t to hwaddr. Signed-off-by: Gerd Hoffmann --- hw/display/ramfb.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/display/ramfb.c b/hw/display/ramfb.c index 6867bce8ae..30f5c8da20 100644 --- a/hw/display/ramfb.c +++ b/hw/display/ramfb.c @@ -36,8 +36,8 @@ static void ramfb_fw_cfg_write(void *dev, off_t offset, size_t len) { RAMFBState *s = dev; void *framebuffer; - uint32_t stride, fourcc, format; - hwaddr addr, length; + uint32_t fourcc, format; + hwaddr stride, addr, length; s->width = be32_to_cpu(s->cfg.width); s->height = be32_to_cpu(s->cfg.height); -- 2.9.3