From: Wei Yongjun <[email protected]> Date: Thu, 11 Jan 2018 11:21:51 +0000
> platform_get_resource() may fail and return NULL, so we should > better check it's return value to avoid a NULL pointer dereference > a bit later in the code. > > This is detected by Coccinelle semantic patch. > > @@ > expression pdev, res, n, t, e, e1, e2; > @@ > > res = platform_get_resource(pdev, t, n); > + if (!res) > + return -EINVAL; > ... when != res == NULL > e = devm_ioremap(e1, res->start, e2); > > Signed-off-by: Wei Yongjun <[email protected]> Applied, thank you. > diff --git a/drivers/net/phy/mdio-bcm-unimac.c > b/drivers/net/phy/mdio-bcm-unimac.c > index 08e0647..8d37066 100644 > --- a/drivers/net/phy/mdio-bcm-unimac.c > +++ b/drivers/net/phy/mdio-bcm-unimac.c > @@ -205,6 +205,8 @@ static int unimac_mdio_probe(struct platform_device *pdev) > return -ENOMEM; > > r = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!r) > + return -EINVAL; > > /* Just ioremap, as this MDIO block is usually integrated into an > * Ethernet MAC controller register range > I have to say, the devm_*() routines may make it easier to write drivers and probe routines, but it makes patches much harder to review. I couldn't figure out if you were leaking resources here without going into the source file and looking at all of the relevant context. Just though I'd make this meta-comment...
