diff options
| author | Firo Yang <firogm@gmail.com> | 2017-05-26 22:37:38 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-05-27 18:44:17 -0400 |
| commit | fb3ce90b7d7761b6f7f28f0ff5c456ef6b5229a1 (patch) | |
| tree | 68115fc1133d475bdfa9e5cc399c20f7715d3ec5 | |
| parent | 6c713a3a23154f4f0c2217ea39811ebe443dafaa (diff) | |
| download | linux-fb3ce90b7d7761b6f7f28f0ff5c456ef6b5229a1.tar.bz2 | |
hdlcdrv: Fix divide by zero in hdlcdrv_ioctl
syszkaller fuzzer triggered a divide by zero, when set calibration
through ioctl().
To fix it, test 'bitrate' if it is negative or 0, just return -EINVAL.
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Firo Yang <firogm@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/hamradio/hdlcdrv.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c index 8c3633c1d078..97e3bc60c3e7 100644 --- a/drivers/net/hamradio/hdlcdrv.c +++ b/drivers/net/hamradio/hdlcdrv.c @@ -576,6 +576,8 @@ static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) case HDLCDRVCTL_CALIBRATE: if(!capable(CAP_SYS_RAWIO)) return -EPERM; + if (s->par.bitrate <= 0) + return -EINVAL; if (bi.data.calibrate > INT_MAX / s->par.bitrate) return -EINVAL; s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16; |