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Message-ID: <Yta4BFfr+OkUmOhl@hoboy.vegasvil.org> Date: Tue, 19 Jul 2022 06:56:20 -0700 From: Richard Cochran <richardcochran@...il.com> To: Divya Koppera <Divya.Koppera@...rochip.com> Cc: andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, UNGLinuxDriver@...rochip.com, Madhuri.Sripada@...rochip.com Subject: Re: [PATCH v2 net] net: phy: micrel: Fix warn: passing zero to PTR_ERR On Tue, Jul 19, 2022 at 05:30:52PM +0530, Divya Koppera wrote: > Handle the NULL pointer case > > Fixes New smatch warnings: > drivers/net/phy/micrel.c:2613 lan8814_ptp_probe_once() warn: passing zero to 'PTR_ERR' > > vim +/PTR_ERR +2613 drivers/net/phy/micrel.c > > Reported-by: kernel test robot <lkp@...el.com> > Reported-by: Dan Carpenter <dan.carpenter@...cle.com> > Fixes: ece19502834d ("net: phy: micrel: 1588 support for LAN8814 phy") > Signed-off-by: Divya Koppera <Divya.Koppera@...rochip.com> > --- > v1 -> v2: > - Handled NULL pointer case > - Changed subject line with net-next to net This is not a genuine bug fix, and so it should target next-next. > --- > drivers/net/phy/micrel.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c > index e78d0bf69bc3..6be6ee156f40 100644 > --- a/drivers/net/phy/micrel.c > +++ b/drivers/net/phy/micrel.c > @@ -2812,12 +2812,16 @@ static int lan8814_ptp_probe_once(struct phy_device *phydev) > > shared->ptp_clock = ptp_clock_register(&shared->ptp_clock_info, > &phydev->mdio.dev); > - if (IS_ERR_OR_NULL(shared->ptp_clock)) { > + if (IS_ERR(shared->ptp_clock)) { > phydev_err(phydev, "ptp_clock_register failed %lu\n", > PTR_ERR(shared->ptp_clock)); > return -EINVAL; > } > > + /* Check if PHC support is missing at the configuration level */ > + if (!shared->ptp_clock) > + return 0; This is cause a NULL pointer de-reference in lan8814_ts_info() when it calls info->phc_index = ptp_clock_index(shared->ptp_clock); > + > phydev_dbg(phydev, "successfully registered ptp clock\n"); > > shared->phydev = phydev; > -- > 2.17.1 > Thanks, Richard
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