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drivers/net/hamradio: Integer overflow in hdlcdrv_ioctl()
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>
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@ -571,6 +571,8 @@ static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
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case HDLCDRVCTL_CALIBRATE:
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if(!capable(CAP_SYS_RAWIO))
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return -EPERM;
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if (bi.data.calibrate > INT_MAX / s->par.bitrate)
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return -EINVAL;
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s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
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return 0;
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