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HID: fix a potential bug in pointer casting

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Don't directly cast list_head * to foo *, this works only when list
is the first member of struct foo, and we should not make the assumption
how members are ordered in the structure.

i.e. struct *f = (struct *f)pos will work if:
	struct foo {
		struct list_head list;
		int i;
	};

but will fail if:
	struct foo {
		int i;
		struct list_head list;
	}

Signed-off-by: Li Zefan <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
This commit is contained in:
Li Zefan 2007-11-14 11:31:05 +01:00 • committed by Jiri Kosina
commit 3ba5619f06
1 changed files with 4 additions and 3 deletions
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7
drivers/hid/usbhid/hid-tmff.c
View file

@ -137,7 +137,8 @@ static int hid_tmff_play(struct input_dev *dev, void *data, struct ff_effect *ef
int hid_tmff_init(struct hid_device *hid)
{
struct tmff_device *tmff;
struct list_head *pos;
struct hid_report *report;
struct list_head *report_list;
struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
struct input_dev *input_dev = hidinput->input;
const signed short *ff_bits = ff_joystick;
@ -149,8 +150,8 @@ int hid_tmff_init(struct hid_device *hid)
return -ENOMEM;
/* Find the report to use */
list_for_each(pos, &hid->report_enum[HID_OUTPUT_REPORT].report_list) {
struct hid_report *report = (struct hid_report *)pos;
report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
list_for_each_entry(report, report_list, list) {
int fieldnum;
for (fieldnum = 0; fieldnum < report->maxfield; ++fieldnum) {