| From | Luis Henriques <> | Subject | [PATCH 3.5 87/96] drivers/net/hamradio: Integer overflow in hdlcdrv_ioctl() | Date | Mon, 13 Jan 2014 14:24:50 +0000 |
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3.5.7.29 -stable review patch. If anyone has any objections, please let me know.
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From: Wenliang Fan <fanwlexca@gmail.com>
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 <fanwlexca@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- 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 a4a3516..3b3a7e0 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
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