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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>
This commit is contained in:
Serge Semin 2017-10-22 23:38:10 +03:00 committed by Greg Kroah-Hartman
parent 2818e13ae1
commit 287c2bb6e1
1 changed files with 7 additions and 7 deletions
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14
drivers/usb/misc/usb251xb.c
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@ -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;