From nobody Sun Feb 8 23:30:34 2026 Delivered-To: importer@patchew.org Received-SPF: temperror (zoho.com: Error in retrieving data from DNS) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=temperror (zoho.com: Error in retrieving data from DNS) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1556605385; cv=none; d=zoho.com; s=zohoarc; b=ERPe8xhQwfDcbdZNEBkDufxGfKWyQOai9z4UrGqEY6lnPlxvMNz8+h0cXl5AFEuXGGZqwFhxYjx+RhJ5y1vAKxDpVht/hx2Ef8iwzaQa8EBo5lJvbhKd/E4gM3wHYSWzlbYAQjRevstzAYv78J1UiguafogctgOq60sZuFrMSxw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1556605385; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:To:ARC-Authentication-Results; bh=STT/tfwC/14ptAHuCMBo63bG46WjXP1qxtoovYQckpM=; b=PkpPE0zOqqUrCaL4BtJN87GBtB7cNOF/xD2EYSk2SFLQMMCJW2k4dkT4G8M8A57qqJTZkgstI2kP/IEuQp5uRZd/mHz2G23VYvquSeb2zm4Po6dCi+vt77qFgsTJVY+ddkqy8I6JkZ0izGyG4H58Pw+ewVP5KAkz3Lk6CEDyKow= ARC-Authentication-Results: i=1; mx.zoho.com; spf=temperror (zoho.com: Error in retrieving data from DNS) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (209.51.188.17 [209.51.188.17]) by mx.zohomail.com with SMTPS id 1556605385387537.7156077481935; Mon, 29 Apr 2019 23:23:05 -0700 (PDT) Received: from localhost ([127.0.0.1]:39773 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hLMAD-00030M-Qo for importer@patchew.org; Tue, 30 Apr 2019 02:22:49 -0400 Received: from eggs.gnu.org ([209.51.188.92]:46546) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hLM9N-0002jH-5k for qemu-devel@nongnu.org; Tue, 30 Apr 2019 02:21:58 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hLM9M-0006tT-0w for qemu-devel@nongnu.org; Tue, 30 Apr 2019 02:21:57 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:2206 helo=huawei.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hLM9L-0006sn-Mo for qemu-devel@nongnu.org; Tue, 30 Apr 2019 02:21:55 -0400 Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 2CDEFAF21C196068A508; Tue, 30 Apr 2019 14:21:51 +0800 (CST) Received: from localhost (10.177.246.209) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.439.0; Tue, 30 Apr 2019 14:21:44 +0800 From: "Longpeng(Mike)" To: Date: Tue, 30 Apr 2019 14:21:41 +0800 Message-ID: <1556605301-44112-1-git-send-email-longpeng2@huawei.com> X-Mailer: git-send-email 1.8.4.msysgit.0 MIME-Version: 1.0 X-Originating-IP: [10.177.246.209] X-CFilter-Loop: Reflected Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 45.249.212.190 Subject: [Qemu-devel] [PATCH v2] usb/xchi: avoid trigger assertion if guest write wrong epid X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Longpeng , Gonglei , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Longpeng we found the following core in our environment: 0 0x00007fc6b06c2237 in raise () 1 0x00007fc6b06c3928 in abort () 2 0x00007fc6b06bb056 in __assert_fail_base () 3 0x00007fc6b06bb102 in __assert_fail () 4 0x0000000000702e36 in xhci_kick_ep (...) 5 0x000000000047897a in memory_region_write_accessor (...) 6 0x000000000047767f in access_with_adjusted_size (...) 7 0x000000000047944d in memory_region_dispatch_write (...) (mr=3Dmr@entry=3D0x7fc6a0138df0, addr=3Daddr@entry=3D156, data=3D1648892416, size=3Dsize@entry=3D4, attrs=3Dattrs@entry=3D...) 8 0x000000000042df17 in address_space_write_continue (...) 10 0x000000000043084d in address_space_rw (...) 11 0x000000000047451b in kvm_cpu_exec (cpu=3Dcpu@entry=3D0x1ab11b0) 12 0x000000000045dcf5 in qemu_kvm_cpu_thread_fn (arg=3D0x1ab11b0) 13 0x0000000000870631 in qemu_thread_start (args=3Dargs@entry=3D0x1acfb50) 14 0x00000000008959a7 in thread_entry_for_hotfix (pthread_cb=3D) 15 0x00007fc6b0a60dd5 in start_thread () 16 0x00007fc6b078a59d in clone () (gdb) f 5 5 0x000000000047897a in memory_region_write_accessor (...) 529 mr->ops->write(mr->opaque, addr, tmp, size); (gdb) p /x tmp $9 =3D 0x62481a00 <-- last byte 0x00 is @epid xhci_doorbell_write() already check the upper bound of @slotid an @epid, it also need to check the lower bound. Cc: Gonglei Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Longpeng Tested-by: Philippe Mathieu-Daud=C3=A9 --- v1 -> v2: 1) update the description, include the full backtrace 2) remove unnecessary check: 'reg =3D=3D 0' --- hw/usb/hcd-xhci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c index ec28bee..d8472b4 100644 --- a/hw/usb/hcd-xhci.c +++ b/hw/usb/hcd-xhci.c @@ -3137,7 +3137,7 @@ static void xhci_doorbell_write(void *ptr, hwaddr reg, streamid =3D (val >> 16) & 0xffff; if (reg > xhci->numslots) { DPRINTF("xhci: bad doorbell %d\n", (int)reg); - } else if (epid > 31) { + } else if (epid =3D=3D 0 || epid > 31) { DPRINTF("xhci: bad doorbell %d write: 0x%x\n", (int)reg, (uint32_t)val); } else { --=20 1.8.3.1