lkml.org 
[lkml]   [2017]   [Sep]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 7/9 v2] usb: usb251xb: Fix property_u32 NULL pointer dereference
Date
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>
---
drivers/usb/misc/usb251xb.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c
index 51cc53ddc..c308b0006 100644
--- a/drivers/usb/misc/usb251xb.c
+++ b/drivers/usb/misc/usb251xb.c
@@ -348,7 +348,7 @@ 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];
@@ -425,16 +425,16 @@ 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);
@@ -498,8 +498,8 @@ 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;
--
2.12.0
\
 
 \ /
  Last update: 2017-09-16 12:44    [W:0.243 / U:4.824 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site