From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52597) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zm0Xp-0008A7-0N for qemu-devel@nongnu.org; Tue, 13 Oct 2015 10:27:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Zm0Xo-0000TK-4i for qemu-devel@nongnu.org; Tue, 13 Oct 2015 10:27:12 -0400 Received: from mail-pa0-x234.google.com ([2607:f8b0:400e:c03::234]:33157) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zm0Xn-0000Sk-Vl for qemu-devel@nongnu.org; Tue, 13 Oct 2015 10:27:12 -0400 Received: by pabrc13 with SMTP id rc13so23177554pab.0 for ; Tue, 13 Oct 2015 07:27:11 -0700 (PDT) Sender: =?UTF-8?B?TWFyYy1BbmRyw6kgTHVyZWF1?= From: marcandre.lureau@redhat.com Date: Tue, 13 Oct 2015 16:25:39 +0200 Message-Id: <1444746378-12338-13-git-send-email-marcandre.lureau@redhat.com> In-Reply-To: <1444746378-12338-1-git-send-email-marcandre.lureau@redhat.com> References: <1444746378-12338-1-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 v3 12/51] ivshmem: limit maximum number of peers to G_MAXUINT16 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, 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 From: Marc-André Lureau Limit the maximum number of peers to MAXUINT16. This is more realistic and better matches the limit of the doorbell register. Signed-off-by: Marc-André Lureau Reviewed-by: Claudio Fontana --- hw/misc/ivshmem.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index e7224b9..3787398 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -34,6 +34,7 @@ #define PCI_VENDOR_ID_IVSHMEM PCI_VENDOR_ID_REDHAT_QUMRANET #define PCI_DEVICE_ID_IVSHMEM 0x1110 +#define IVSHMEM_MAX_PEERS G_MAXUINT16 #define IVSHMEM_IOEVENTFD 0 #define IVSHMEM_MSI 1 @@ -421,8 +422,8 @@ static int increase_dynamic_storage(IVShmemState *s, int new_min_size) int j, old_nb_alloc; - /* check for integer overflow */ - if (new_min_size >= INT_MAX / sizeof(Peer) - 1 || new_min_size <= 0) { + /* limit number of max peers */ + if (new_min_size <= 0 || new_min_size > IVSHMEM_MAX_PEERS) { return -1; } -- 2.4.3