Messages in this thread | | | Subject | Re: [PATCH] thermal: Fix potential NULL pointer accesses | From | Zhang Rui <> | Date | Thu, 09 Aug 2012 08:44:55 +0800 |
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On 二, 2012-08-07 at 22:36 -0700, Guenter Roeck wrote: > The type parameter in thermal_zone_device_register and > thermal_cooling_device_register can be NULL, indicating that no sysfs attribute > for the type should be created. Only call strlen() and strcpy() on type if it is > not NULL. > > This patch addresses Coverity #102180 and #102182: Dereference before null check > > Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Zhang Rui <rui.zhang@intel.com>
> --- > Applies on top of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux.git (thermal). > > drivers/thermal/thermal_sys.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c > index 5be8728..e69f76d 100644 > --- a/drivers/thermal/thermal_sys.c > +++ b/drivers/thermal/thermal_sys.c > @@ -900,7 +900,7 @@ thermal_cooling_device_register(char *type, void *devdata, > struct thermal_zone_device *pos; > int result; > > - if (strlen(type) >= THERMAL_NAME_LENGTH) > + if (type && strlen(type) >= THERMAL_NAME_LENGTH) > return ERR_PTR(-EINVAL); > > if (!ops || !ops->get_max_state || !ops->get_cur_state || > @@ -917,7 +917,7 @@ thermal_cooling_device_register(char *type, void *devdata, > return ERR_PTR(result); > } > > - strcpy(cdev->type, type); > + strcpy(cdev->type, type ? : ""); > mutex_init(&cdev->lock); > INIT_LIST_HEAD(&cdev->thermal_instances); > cdev->ops = ops; > @@ -1343,7 +1343,7 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, > int count; > int passive = 0; > > - if (strlen(type) >= THERMAL_NAME_LENGTH) > + if (type && strlen(type) >= THERMAL_NAME_LENGTH) > return ERR_PTR(-EINVAL); > > if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) > @@ -1365,7 +1365,7 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, > return ERR_PTR(result); > } > > - strcpy(tz->type, type); > + strcpy(tz->type, type ? : ""); > tz->ops = ops; > tz->device.class = &thermal_class; > tz->devdata = devdata;
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