Return-Path: Message-Id: <20140512003204.505452782@1wt.eu> Date: Mon, 12 May 2014 02:33:33 +0200 From: Willy Tarreau To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Wenliang Fan , "David S. Miller" , Willy Tarreau Subject: [ 093/143] drivers/net/hamradio: Integer overflow in hdlcdrv_ioctl() In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: 2.6.32-longterm review patch. If anyone has any objections, please let me know. ------------------ From: Wenliang Fan [ Upstream commit e9db5c21d3646a6454fcd04938dd215ac3ab620a ] 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: Willy Tarreau --- 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 91c5790..c1b265d 100644 --- a/drivers/net/hamradio/hdlcdrv.c +++ b/drivers/net/hamradio/hdlcdrv.c @@ -572,6 +572,8 @@ 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; -- 1.7.12.2.21.g234cd45.dirty