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HID: hidraw: add proper error handling to raw event reporting 

If kmemdup() in hidraw_report_event() fails, we are not propagating
this fact properly.

Let hidraw_report_event() and hid_report_raw_event() return an error
value to the caller.

Reported-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jiri Kosina 2012-04-27 00:56:08 +02:00
parent d4f0e4daf0
commit b6787242f3
4 changed files with 27 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/hid/hid-core.c
View File

@ -1032,7 +1032,7 @@ static struct hid_report *hid_get_report(struct hid_report_enum *report_enum,
return report;
}
void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
int interrupt)
{
struct hid_report_enum *report_enum = hid->report_enum + type;
@ -1040,10 +1040,11 @@ void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
unsigned int a;
int rsize, csize = size;
u8 *cdata = data;
int ret = 0;
report = hid_get_report(report_enum, data);
if (!report)
return;
goto out;
if (report_enum->numbered) {
cdata++;
@ -1063,14 +1064,19 @@ void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_report_event)
hid->hiddev_report_event(hid, report);
if (hid->claimed & HID_CLAIMED_HIDRAW)
hidraw_report_event(hid, data, size);
if (hid->claimed & HID_CLAIMED_HIDRAW) {
ret = hidraw_report_event(hid, data, size);
if (ret)
goto out;
}
for (a = 0; a < report->maxfield; a++)
hid_input_field(hid, report->field[a], cdata, interrupt);
if (hid->claimed & HID_CLAIMED_INPUT)
hidinput_report_event(hid, report);
out:
return ret;
}
EXPORT_SYMBOL_GPL(hid_report_raw_event);
@ -1147,7 +1153,7 @@ nomem:
}
}
hid_report_raw_event(hid, type, data, size, interrupt);
ret = hid_report_raw_event(hid, type, data, size, interrupt);
unlock:
up(&hid->driver_lock);

19
drivers/hid/hidraw.c
View File

@ -87,11 +87,13 @@ static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count,
len = list->buffer[list->tail].len > count ?
count : list->buffer[list->tail].len;
if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
ret = -EFAULT;
goto out;
if (list->buffer[list->tail].value) {
if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
ret = -EFAULT;
goto out;
}
ret = len;
}
ret = len;
kfree(list->buffer[list->tail].value);
list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
@ -437,19 +439,24 @@ static const struct file_operations hidraw_ops = {
.llseek = noop_llseek,
};
void hidraw_report_event(struct hid_device *hid, u8 *data, int len)
int hidraw_report_event(struct hid_device *hid, u8 *data, int len)
{
struct hidraw *dev = hid->hidraw;
struct hidraw_list *list;
int ret = 0;
list_for_each_entry(list, &dev->list, node) {
list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC);
if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) {
ret = -ENOMEM;
break;
}
list->buffer[list->head].len = len;
list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
kill_fasync(&list->fasync, SIGIO, POLL_IN);
}
wake_up_interruptible(&dev->wait);
return ret;
}
EXPORT_SYMBOL_GPL(hidraw_report_event);

2
include/linux/hid.h
View File

@ -896,7 +896,7 @@ static inline int hid_hw_power(struct hid_device *hdev, int level)
return hdev->ll_driver->power ? hdev->ll_driver->power(hdev, level) : 0;
}
void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
int interrupt);
extern int hid_generic_init(void);

4
include/linux/hidraw.h
View File

@ -76,13 +76,13 @@ struct hidraw_list {
#ifdef CONFIG_HIDRAW
int hidraw_init(void);
void hidraw_exit(void);
void hidraw_report_event(struct hid_device *, u8 *, int);
int hidraw_report_event(struct hid_device *, u8 *, int);
int hidraw_connect(struct hid_device *);
void hidraw_disconnect(struct hid_device *);
#else
static inline int hidraw_init(void) { return 0; }
static inline void hidraw_exit(void) { }
static inline void hidraw_report_event(struct hid_device *hid, u8 *data, int len) { }
static inline int hidraw_report_event(struct hid_device *hid, u8 *data, int len) { }
static inline int hidraw_connect(struct hid_device *hid) { return -1; }
static inline void hidraw_disconnect(struct hid_device *hid) { }
#endif