On Sat, Mar 16, 2013 at 02:10:22AM +0000, Ben Hutchings wrote:
> On Tue, 2013-03-12 at 15:44 -0700, Greg Kroah-Hartman wrote:
> > 3.0-stable review patch. If anyone has any objections, please let me know.
> >
> > ------------------
> >
> > From: Asias He <asias@xxxxxxxxxx>
> >
> > commit 472b72f2db7831d7dbe22ffdff4adee3bd49b05d upstream.
> >
> > The page++ is wrong. It makes bio_add_pc_page() pointing to a wrong page
> > address if the 'while (len > 0 && data_len > 0) { ... }' loop is
> > executed more than one once.
> >
> > Signed-off-by: Asias He <asias@xxxxxxxxxx>
> > Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> >
> > ---
> > drivers/target/target_core_pscsi.c | 1 -
> > 1 file changed, 1 deletion(-)
> >
> > --- a/drivers/target/target_core_pscsi.c
> > +++ b/drivers/target/target_core_pscsi.c
> > @@ -1210,7 +1210,6 @@ static int __pscsi_map_task_SG(
> > bio = NULL;
> > }
> >
> > - page++;
> > len -= bytes;
> > data_len -= bytes;
> > off = 0;
>
> So in case a fragment crosses a page boundary, we wrap around to the
> beginning of the same page? That doesn't look right.
If the fragment crosses a page boundary, what is the correct page
for it?
Nicholas, can we assume sg->length + sg->offset should be less than PAGE_SIZE here?
> Ben.
>
> --
> Ben Hutchings
> It is easier to change the specification to fit the program than vice versa.
--
Asias
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