On Sat, Jan 04, 2014 at 12:23:41PM +0100, Johan Hovold wrote:
> On Sat, Jan 04, 2014 at 05:28:35AM +0800, kbuild test robot wrote:
> > tree: git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-next
> > head: bd6383c81d5f33e01688a87c50a8d3a878aa43d5
> > commit: 362eb02603be7bb835c47f2cf585954a5080449d [50/92] USB: pl2303: add error handling to vendor read and write functions
> >
> > New smatch warnings:
> > drivers/usb/serial/pl2303.c:149 pl2303_vendor_read() error: doing dma on the stack (buf)
> >
> > Old smatch warnings:
> > drivers/usb/serial/pl2303.c:673 pl2303_ioctl() warn: check that 'ser' doesn't leak information (struct has a hole after 'iomem_reg_shift')
> >
> > vim +149 drivers/usb/serial/pl2303.c
> >
> > 8bf769eb Johan Hovold 2012-10-15 133 };
> > 8bf769eb Johan Hovold 2012-10-15 134
> > ^1da177e Linus Torvalds 2005-04-16 135 struct pl2303_private {
> > ^1da177e Linus Torvalds 2005-04-16 136 spinlock_t lock;
> > ^1da177e Linus Torvalds 2005-04-16 137 u8 line_control;
> > ^1da177e Linus Torvalds 2005-04-16 138 u8 line_status;
> > 623c8263 Johan Hovold 2013-12-29 139
> > 623c8263 Johan Hovold 2013-12-29 140 u8 line_settings[7];
> > ^1da177e Linus Torvalds 2005-04-16 141 };
> > ^1da177e Linus Torvalds 2005-04-16 142
> > 362eb026 Johan Hovold 2013-12-29 143 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
> > 362eb026 Johan Hovold 2013-12-29 144 unsigned char buf[1])
>
> This is a false positive. A pointer passed as an array is still just a
> pointer (and in this case the buffer it points to is not on the stack).
>
> Looks like smatch needs to be updated.
>
Thanks. I have written a fix for this and will push next week.
regards,
dan carpenter
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