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SubjectRe: [PATCH] IB/mlx4: prevent undefined shift in set_user_sq_size()
On Mon, Jun 10, 2019 at 10:28:49AM -0300, Jason Gunthorpe wrote:
> On Sat, Jun 08, 2019 at 12:22:31PM +0300, Dan Carpenter wrote:
> > The ucmd->log_sq_bb_count is a u8 that comes from the user. If it's
> > larger than the number of bits in an int then that's undefined behavior.
> > It turns out this doesn't really cause an issue at runtime but it's
> > still nice to clean it up.
> >
> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> > ---
> > drivers/infiniband/hw/mlx4/qp.c | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
> > index 5221c0794d1d..9f6eb23e8044 100644
> > --- a/drivers/infiniband/hw/mlx4/qp.c
> > +++ b/drivers/infiniband/hw/mlx4/qp.c
> > @@ -439,7 +439,8 @@ static int set_user_sq_size(struct mlx4_ib_dev *dev,
> > struct mlx4_ib_create_qp *ucmd)
> > {
> > /* Sanity check SQ size before proceeding */
> > - if ((1 << ucmd->log_sq_bb_count) > dev->dev->caps.max_wqes ||
> > + if (ucmd->log_sq_bb_count > 31 ||
> > + (1 << ucmd->log_sq_bb_count) > dev->dev->caps.max_wqes ||
>
> Surely this should use check_shl_overflow() ?
>

Same for the other one I sent. I'll resend in a couple days. No rush.

regards,
dan carpenter

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