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SubjectRe: [PATCH 02/14] HID: i2c-hid: fix memory corruption due to missing hid declaration
On Wed, 5 Dec 2012, Benjamin Tissoires wrote:

> > On Tue, 4 Dec 2012 16:27:43 +0100, Benjamin Tissoires wrote:
> >> HID descriptors contains 4 bytes of reserved field.
> >> The previous implementation was overriding the next fields in struct i2c_hid.
> >>
> >> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
> >> ---
> >> drivers/hid/i2c-hid/i2c-hid.c | 3 ++-
> >> 1 file changed, 2 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
> >> index 0fbb229..ad771a7 100644
> >> --- a/drivers/hid/i2c-hid/i2c-hid.c
> >> +++ b/drivers/hid/i2c-hid/i2c-hid.c
> >> @@ -68,6 +68,7 @@ struct i2c_hid_desc {
> >> __le16 wVendorID;
> >> __le16 wProductID;
> >> __le16 wVersionID;
> >> + __le32 reserved;
> >> } __packed;
> >>
> >> struct i2c_hid_cmd {
> >> @@ -778,7 +779,7 @@ static int __devinit i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
> >> }
> >>
> >> dsize = le16_to_cpu(hdesc->wHIDDescLength);
> >> - if (!dsize || dsize > HID_MAX_DESCRIPTOR_SIZE) {
> >> + if (!dsize || dsize > sizeof(struct i2c_hid_desc)) {
> >
> > Shouldn't !dsize rather be dsize < 4? You're reading hdesc->bcdVersion,
> > which is only defined if dsize >= 4 if I understand the code correctly.
>
> Yes, you are right. Thanks.
>
> Jiri, this patch is a prerequisite for "[PATCH 10/14] HID: i2c-hid:
> reorder allocation/free of buffers".
> could you please what for a v2 before applying 10/14?

Absolutely. I still have to review 9, 10, 11, 12, 13, 14, so am dropping 2
and 10 from my attention for now.

--
Jiri Kosina
SUSE Labs


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