[PATCH -next] [media] go7007: fix invalid use of sizeof in go7007_usb_i2c_master_xfer()
Dan Carpenter
dan.carpenter at oracle.com
Tue Mar 26 07:35:57 UTC 2013
On Tue, Mar 26, 2013 at 10:04:15AM +0300, Dan Carpenter wrote:
> On Tue, Mar 26, 2013 at 02:42:47PM +0800, Wei Yongjun wrote:
> > From: Wei Yongjun <yongjun_wei at trendmicro.com.cn>
> >
> > sizeof() when applied to a pointer typed expression gives the
> > size of the pointer, not that of the pointed data.
> >
>
> This fix isn't right. "buf" is a char pointer. I don't know what
> this code is doing. Instead of sizeof(*buf) it should be something
> like "buflen", "msg[i].len", "msg[i].len + 1" or "msg[i].len + 3".
It should be "msg[i].len + 1", I think.
On the line before it writes buflen bytes to the hardware. Then
it clears the transfer buffer and reads "msg[i].len + 1" bytes from
the hardware. Then it saves the memory, except for the first byte,
in msg[i].buf.
So it should clear "msg[i].len + 1" bytes so that the old data isn't
confused with the data that we read from the hardware.
regards,
dan carpenter
More information about the devel
mailing list