From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Wenliang Fan , "David S. Miller" , Luis Henriques Subject: [PATCH 3.11 182/208] drivers/net/hamradio: Integer overflow in hdlcdrv_ioctl() Date: Mon, 13 Jan 2014 16:00:23 +0000 Message-Id: <1389628849-1614-183-git-send-email-luis.henriques@canonical.com> In-Reply-To: <1389628849-1614-1-git-send-email-luis.henriques@canonical.com> References: <1389628849-1614-1-git-send-email-luis.henriques@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.11.10.3 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Wenliang Fan commit e9db5c21d3646a6454fcd04938dd215ac3ab620a upstream. The local variable 'bi' comes from userspace. If userspace passed a large number to 'bi.data.calibrate', there would be an integer overflow in the following line: s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16; Signed-off-by: Wenliang Fan Signed-off-by: David S. Miller Signed-off-by: Luis Henriques --- drivers/net/hamradio/hdlcdrv.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c index 3169252..5d78c1d 100644 --- a/drivers/net/hamradio/hdlcdrv.c +++ b/drivers/net/hamradio/hdlcdrv.c @@ -571,6 +571,8 @@ static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) case HDLCDRVCTL_CALIBRATE: if(!capable(CAP_SYS_RAWIO)) return -EPERM; + if (bi.data.calibrate > INT_MAX / s->par.bitrate) + return -EINVAL; s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16; return 0; -- 1.8.3.2