From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53243) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZjZGP-0003tB-VS for qemu-devel@nongnu.org; Tue, 06 Oct 2015 16:55:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZjZGO-0004b8-28 for qemu-devel@nongnu.org; Tue, 06 Oct 2015 16:55:08 -0400 Received: from mail-qg0-x234.google.com ([2607:f8b0:400d:c04::234]:34683) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZjXnk-0005mm-4Z for qemu-devel@nongnu.org; Tue, 06 Oct 2015 15:21:28 -0400 Received: by qgez77 with SMTP id z77so184248130qge.1 for ; Tue, 06 Oct 2015 12:21:27 -0700 (PDT) Sender: =?UTF-8?B?TWFyYy1BbmRyw6kgTHVyZWF1?= From: marcandre.lureau@redhat.com Date: Tue, 6 Oct 2015 21:19:25 +0200 Message-Id: <1444159184-18153-30-git-send-email-marcandre.lureau@redhat.com> In-Reply-To: <1444159184-18153-1-git-send-email-marcandre.lureau@redhat.com> References: <1444159184-18153-1-git-send-email-marcandre.lureau@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PULL 29/48] ivshmem: error on too many eventfd received List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: peter.maydell@linaro.org Cc: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , qemu-devel@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 */ -- 2.4.3