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authorLi Zefan <lizf@cn.fujitsu.com>2007-11-14 11:31:05 +0100
committerJiri Kosina <jkosina@suse.cz>2008-01-28 14:51:19 +0100
commit3ba5619f06300cd0944150901ed20de87483ad8c (patch)
tree2fab950f6766fc7c5d2242ac6063ee92c4e8e546
parentc80e5ffac0579499ca28444155118ffcdd9b8d7e (diff)
HID: fix a potential bug in pointer casting
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 <lizf@cn.fujitsu.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
-rw-r--r--drivers/hid/usbhid/hid-tmff.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/hid/usbhid/hid-tmff.c b/drivers/hid/usbhid/hid-tmff.c
index 69882a726e9..144578b1a00 100644
--- a/drivers/hid/usbhid/hid-tmff.c
+++ b/drivers/hid/usbhid/hid-tmff.c
@@ -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) {