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 X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 3E626C433E2 for ; Mon, 31 Aug 2020 15:33:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1520E214D8 for ; Mon, 31 Aug 2020 15:33:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598887988; bh=r5LdmNC2g7FIRe6CwrmHuVuU4fXEV1nY9Ab8Ln9jqTU=; h=From:To:Cc:Subject:Date:List-ID:From; b=fTlxwm5k6qgWorH18Hpt1eG+U4Gp/0ROu3JRb2te7/u7H6g9s2+F+iGRKe6EgtyOy EvDT7X8WEZ2J6aQTALGh6ASKugwEMWOrL5Mj0sfCu/aKURysdCyB7W7qmvzGypSlLd FBl+E128SWcGf/XnbTXvDRy1EVzzbpBneQda81g4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728653AbgHaPdH (ORCPT ); Mon, 31 Aug 2020 11:33:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:43470 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729041AbgHaPcD (ORCPT ); Mon, 31 Aug 2020 11:32:03 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0AFD121582; Mon, 31 Aug 2020 15:32:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598887923; bh=r5LdmNC2g7FIRe6CwrmHuVuU4fXEV1nY9Ab8Ln9jqTU=; h=From:To:Cc:Subject:Date:From; b=lAMslzJcr1hvkxQr37o8z/VLtHWvIcV6NmL0P/Imj0oOjvASOtk3kQcf2yZFPxKid bv8SxDPx5+XBFSrBwttDijXTYD9ODWMQiUbbod7FyUUqiCB60+snPdHrE5Y8UJuTcb MTGDBha3vwxratoDbNXDrOFlZa8akKXIGIgwLLMQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Peilin Ye , syzbot+34ee1b45d88571c2fa8b@syzkaller.appspotmail.com, Dan Carpenter , Jiri Kosina , Sasha Levin , linux-usb@vger.kernel.org, linux-input@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 1/5] HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage() Date: Mon, 31 Aug 2020 11:31:56 -0400 Message-Id: <20200831153200.1024898-1-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: Peilin Ye [ Upstream commit 25a097f5204675550afb879ee18238ca917cba7a ] `uref->usage_index` is not always being properly checked, causing hiddev_ioctl_usage() to go out of bounds under some cases. Fix it. Reported-by: syzbot+34ee1b45d88571c2fa8b@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?id=f2aebe90b8c56806b050a20b36f51ed6acabe802 Reviewed-by: Dan Carpenter Signed-off-by: Peilin Ye Signed-off-by: Jiri Kosina Signed-off-by: Sasha Levin --- drivers/hid/usbhid/hiddev.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c index dbdd265075daf..7bce23a43907e 100644 --- a/drivers/hid/usbhid/hiddev.c +++ b/drivers/hid/usbhid/hiddev.c @@ -554,12 +554,16 @@ static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, switch (cmd) { case HIDIOCGUSAGE: + if (uref->usage_index >= field->report_count) + goto inval; uref->value = field->value[uref->usage_index]; if (copy_to_user(user_arg, uref, sizeof(*uref))) goto fault; goto goodreturn; case HIDIOCSUSAGE: + if (uref->usage_index >= field->report_count) + goto inval; field->value[uref->usage_index] = uref->value; goto goodreturn; -- 2.25.1