Re: [PATCH] video: arcfb: fix buffer overflow

[Dan Carpenter]

On Wed, Nov 24, 2010 at 03:25:58PM +0900, Paul Mundt wrote:
> On Sun, Nov 21, 2010 at 08:40:01PM +0300, Vasiliy Kulikov wrote:
> > (count + p) is not checked for integer overflow.  If p < fbmemlength
> > and count == (size_t)(1 - p) (very big unsigned integer) then
> > count + p == 1 < fbmemlength and copy_to_user(base_addr+p, buf, count)
> > overflows base_addr.
> > 
> > Signed-off-by: Vasiliy Kulikov <segoon@xxxxxxxxxxxx>
> 
> Applied, thanks.

The patch is harmless, but the integer overflow would actually be caught
in rw_verify_area().

regards,
dan carpenter

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