linux-kernel - Re: [PATCH] net/mlx5e: Fix freeing of unassigned pointer

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Message-ID: <20201007091349.cceyuje3ktilygzv@medion>
Date:   Wed, 7 Oct 2020 10:13:49 +0100
From:   Alex Dewar <alex.dewar90@...il.com>
To:     Saeed Mahameed <saeed@...nel.org>
Cc:     Alex Dewar <alex.dewar90@...il.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/mlx5e: Fix freeing of unassigned pointer

On Tue, Oct 06, 2020 at 04:22:12PM -0700, Saeed Mahameed wrote:
> On Sat, 2020-10-03 at 12:10 +0100, Alex Dewar wrote:
> > Commit ff7ea04ad579 ("net/mlx5e: Fix potential null pointer
> > dereference")
> > added some missing null checks but the error handling in
> > mlx5e_alloc_flow() was left broken: the variable attr is passed to
> > kfree
> > although it is never assigned to and never needs to be freed in this
> > function. Fix this.
> > 
> > Addresses-Coverity-ID: 1497536 ("Memory - illegal accesses")
> > Fixes: ff7ea04ad579 ("net/mlx5e: Fix potential null pointer
> > dereference")
> > Signed-off-by: Alex Dewar <alex.dewar90@...il.com>
> > ---
> >  drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 17 +++++++++----
> > ----
> >  1 file changed, 9 insertions(+), 8 deletions(-)
> > 
> 
> Hi Alex, thanks for the patch, 
> Colin submitted a one liner patch that I already picked up.
> 
> I hope you are ok with this.

Hi Saeed,

Sure. As long as attr is no longer being freed then that should fix the
problem.

Best,
Alex

> 
> Thanks,
> Saeed.
>