From patchwork Fri Oct 2 19:09:32 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= X-Patchwork-Id: 525750 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 77D1C1402F0 for ; Sat, 3 Oct 2015 05:33:50 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=TKSoQnhn; dkim-atps=neutral Received: from localhost ([::1]:34675 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zi65U-0007j3-9u for incoming@patchwork.ozlabs.org; Fri, 02 Oct 2015 15:33:48 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34260) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zi5jF-0007d8-Jl for qemu-devel@nongnu.org; Fri, 02 Oct 2015 15:10:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Zi5jB-0007oV-KA for qemu-devel@nongnu.org; Fri, 02 Oct 2015 15:10:49 -0400 Received: from mail-wi0-x22a.google.com ([2a00:1450:400c:c05::22a]:38628) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zi5jB-0007oE-EO for qemu-devel@nongnu.org; Fri, 02 Oct 2015 15:10:45 -0400 Received: by wiclk2 with SMTP id lk2so43248609wic.1 for ; Fri, 02 Oct 2015 12:10:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-type:content-transfer-encoding; bh=irE7bknAWWXXtiBHf1BNRFuODSjZs7EHCa8VgfwV8BE=; b=TKSoQnhnQf74+FaGxBYjOqWlMvhwTZvqk0ZIe9OLx2AbLxX5UZv5HIwwGJMAuojFqt gCNZ38ODj7cODXCiVyRVJsTvnExkTXBLw6zmj8GOW6TlxwNGOySljmzPmdvn/L7QQGsZ 0oUmWyoN1JfdLXn4AzLIGKDAU2Qm6PTfNdIpgWqzh3nmMLZXevmmyYW/yndOu88rvuW3 rbaAW6FYAtjMRpLTe4l6WsnKp5+QRViLO2504MLZFAMNvXDjbdzF/lUHosIJ1HX3/3uJ G0rY0pqjLOix03Itb5C6Pg+CQcDmG8fF73BD/ke9Wyjkwz8vMFc/I6Hovl3Ybod5JFvY hjXA== X-Received: by 10.194.185.16 with SMTP id ey16mr20647362wjc.32.1443813044926; Fri, 02 Oct 2015 12:10:44 -0700 (PDT) Received: from localhost (bne75-h02-31-39-163-232.dsl.sta.abo.bbox.fr. [31.39.163.232]) by smtp.gmail.com with ESMTPSA id fr10sm391585wib.14.2015.10.02.12.10.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 02 Oct 2015 12:10:44 -0700 (PDT) From: marcandre.lureau@redhat.com To: qemu-devel@nongnu.org Date: Fri, 2 Oct 2015 21:09:32 +0200 Message-Id: <1443812991-17356-30-git-send-email-marcandre.lureau@redhat.com> X-Mailer: git-send-email 2.4.3 In-Reply-To: <1443812991-17356-1-git-send-email-marcandre.lureau@redhat.com> References: <1443812991-17356-1-git-send-email-marcandre.lureau@redhat.com> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2a00:1450:400c:c05::22a Cc: drjones@redhat.com, claudio.fontana@huawei.com, stefanha@redhat.com, =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , pbonzini@redhat.com, cam@cs.ualberta.ca Subject: [Qemu-devel] [PATCH v5 29/48] ivshmem: error on too many eventfd received X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Marc-André Lureau The number of eventfd that can be handled per peer is limited by the number of vectors. Return an error when receiving too many of them. Signed-off-by: Marc-André Lureau Reviewed-by: Claudio Fontana --- hw/misc/ivshmem.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index 0e31d1d..50af4c7 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -571,6 +571,14 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size) /* each peer has an associated array of eventfds, and we keep * track of how many eventfds received so far */ /* get a new eventfd: */ + /* get a new eventfd */ + if (peer->nb_eventfds >= s->vectors) { + error_report("Too many eventfd received, device has %d vectors", + s->vectors); + close(incoming_fd); + return; + } + new_eventfd = peer->nb_eventfds++; /* this is an eventfd for a particular peer VM */