diff options
| author | Serge Semin <fancer.lancer@gmail.com> | 2017-10-22 22:38:10 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-01 17:14:21 +0100 |
| commit | 287c2bb6e1b5b1299da59537fe58515001286c85 (patch) | |
| tree | 7b8723c070c80b29b7204a6b2dae17b572182448 /drivers/usb/misc | |
| parent | usb: usb251xb: Add USB2517 LED settings (diff) | |
| download | linux-287c2bb6e1b5b1299da59537fe58515001286c85.tar.xz linux-287c2bb6e1b5b1299da59537fe58515001286c85.zip | |
usb: usb251xb: Fix property_u32 NULL pointer dereference
The methods like of_property_read_u32 utilizing the specified
pointer permit only the pointer to a preallocated u32 storage as the
third argument. As a result the driver crashes on NULL pointer
dereference in case if "oc-delay-us" or "power-on-time-ms" declared
in dts file.
Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/misc')
| -rw-r--r-- | drivers/usb/misc/usb251xb.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c index 5263b8acc772..333f61baf145 100644 --- a/drivers/usb/misc/usb251xb.c +++ b/drivers/usb/misc/usb251xb.c @@ -347,7 +347,7 @@ static int usb251xb_get_ofdata(struct usb251xb *hub, struct device *dev = hub->dev; struct device_node *np = dev->of_node; int len, err, i; - u32 *property_u32 = NULL; + u32 property_u32 = 0; const u32 *cproperty_u32; const char *cproperty_char; char str[USB251XB_STRING_BUFSIZE / 2]; @@ -424,16 +424,16 @@ static int usb251xb_get_ofdata(struct usb251xb *hub, if (of_get_property(np, "dynamic-power-switching", NULL)) hub->conf_data2 |= BIT(7); - if (!of_property_read_u32(np, "oc-delay-us", property_u32)) { - if (*property_u32 == 100) { + if (!of_property_read_u32(np, "oc-delay-us", &property_u32)) { + if (property_u32 == 100) { /* 100 us*/ hub->conf_data2 &= ~BIT(5); hub->conf_data2 &= ~BIT(4); - } else if (*property_u32 == 4000) { + } else if (property_u32 == 4000) { /* 4 ms */ hub->conf_data2 &= ~BIT(5); hub->conf_data2 |= BIT(4); - } else if (*property_u32 == 16000) { + } else if (property_u32 == 16000) { /* 16 ms */ hub->conf_data2 |= BIT(5); hub->conf_data2 |= BIT(4); @@ -500,8 +500,8 @@ static int usb251xb_get_ofdata(struct usb251xb *hub, } hub->power_on_time = USB251XB_DEF_POWER_ON_TIME; - if (!of_property_read_u32(np, "power-on-time-ms", property_u32)) - hub->power_on_time = min_t(u8, *property_u32 / 2, 255); + if (!of_property_read_u32(np, "power-on-time-ms", &property_u32)) + hub->power_on_time = min_t(u8, property_u32 / 2, 255); if (of_property_read_u16_array(np, "language-id", &hub->lang_id, 1)) hub->lang_id = USB251XB_DEF_LANGUAGE_ID; |