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>
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2818e13ae1
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287c2bb6e1
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@ -347,7 +347,7 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
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struct device *dev = hub->dev;
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struct device_node *np = dev->of_node;
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int len, err, i;
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u32 *property_u32 = NULL;
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u32 property_u32 = 0;
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const u32 *cproperty_u32;
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const char *cproperty_char;
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char str[USB251XB_STRING_BUFSIZE / 2];
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@ -424,16 +424,16 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
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if (of_get_property(np, "dynamic-power-switching", NULL))
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hub->conf_data2 |= BIT(7);
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if (!of_property_read_u32(np, "oc-delay-us", property_u32)) {
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if (*property_u32 == 100) {
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if (!of_property_read_u32(np, "oc-delay-us", &property_u32)) {
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if (property_u32 == 100) {
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/* 100 us*/
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hub->conf_data2 &= ~BIT(5);
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hub->conf_data2 &= ~BIT(4);
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} else if (*property_u32 == 4000) {
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} else if (property_u32 == 4000) {
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/* 4 ms */
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hub->conf_data2 &= ~BIT(5);
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hub->conf_data2 |= BIT(4);
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} else if (*property_u32 == 16000) {
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} else if (property_u32 == 16000) {
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/* 16 ms */
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hub->conf_data2 |= BIT(5);
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hub->conf_data2 |= BIT(4);
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@ -500,8 +500,8 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
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}
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hub->power_on_time = USB251XB_DEF_POWER_ON_TIME;
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if (!of_property_read_u32(np, "power-on-time-ms", property_u32))
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hub->power_on_time = min_t(u8, *property_u32 / 2, 255);
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if (!of_property_read_u32(np, "power-on-time-ms", &property_u32))
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hub->power_on_time = min_t(u8, property_u32 / 2, 255);
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if (of_property_read_u16_array(np, "language-id", &hub->lang_id, 1))
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hub->lang_id = USB251XB_DEF_LANGUAGE_ID;
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