linux-kernel - Re: [PATCH][next] RDMA/bnxt_re: fix or'ing of data into an uninitialized struct member

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Message-ID: <CANjDDBj=kzvaWZfwe6rrJki9crfCGxUaBi2Pc+Cb3+MSWYtAVA@mail.gmail.com>
Date:   Mon, 11 Feb 2019 19:11:31 +0530
From:   Devesh Sharma <devesh.sharma@...adcom.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Selvin Xavier <selvin.xavier@...adcom.com>,
        Somnath Kotur <somnath.kotur@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] RDMA/bnxt_re: fix or'ing of data into an
 uninitialized struct member

On Mon, Feb 11, 2019 at 7:04 PM Colin King <colin.king@...onical.com> wrote:
>
> From: Colin Ian King <colin.king@...onical.com>
>
> The struct member comp_mask has not been initialized however a bit
> pattern is being bitwise or'd into the member and hence other bit
> fields in comp_mask may contain any garbage from the stack. Fix this
> by making the bitwise or into an assignment.
>
> Fixes: 95b86d1c91ad ("RDMA/bnxt_re: Update kernel user abi to pass chip context")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/infiniband/hw/bnxt_re/ib_verbs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
> index 1d7469e23cde..de5cb9a61a78 100644
> --- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
> +++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
> @@ -3720,7 +3720,7 @@ struct ib_ucontext *bnxt_re_alloc_ucontext(struct ib_device *ibdev,
>         }
>         spin_lock_init(&uctx->sh_lock);
>
> -       resp.comp_mask |= BNXT_RE_UCNTX_CMASK_HAVE_CCTX;
> +       resp.comp_mask = BNXT_RE_UCNTX_CMASK_HAVE_CCTX;
>         chip_met_rev_num = rdev->chip_ctx.chip_num;
>         chip_met_rev_num |= ((u32)rdev->chip_ctx.chip_rev & 0xFF) <<
>                              BNXT_RE_CHIP_ID0_CHIP_REV_SFT;
> --
> 2.20.1
>
Thanks  that was missed!

Acked-By: Devesh Sharma <devesh.sharma@...adcom.com>