From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eli Cohen Subject: Re: [patch] mlx5: use after free in mlx5_cmd_comp_handler() Date: Wed, 24 Jul 2013 19:35:44 +0300 Message-ID: <20130724163544.GA29427@mtldesk30> References: <20130722080201.GG14617@longonot.mountain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Eli Cohen , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, kernel-janitors@vger.kernel.org To: Dan Carpenter , moshel@mellanox.com Return-path: Content-Disposition: inline In-Reply-To: <20130722080201.GG14617@longonot.mountain> Sender: kernel-janitors-owner@vger.kernel.org List-Id: netdev.vger.kernel.org This race has been spotted and fixed by Moshe Lazer two weeks ago. Anyways, Acked by Eli Cohen On Mon, Jul 22, 2013 at 11:02:01AM +0300, Dan Carpenter wrote: > We can't dereference "ent" after passing it to free_cmd(). > > Signed-off-by: Dan Carpenter > > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c > index 205753a..4037406 100644 > --- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c > +++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c > @@ -1113,7 +1113,13 @@ void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, unsigned long vector) > > for (i = 0; i < (1 << cmd->log_sz); i++) { > if (test_bit(i, &vector)) { > + struct semaphore *sem; > + > ent = cmd->ent_arr[i]; > + if (ent->page_queue) > + sem = &cmd->pages_sem; > + else > + sem = &cmd->sem; > ktime_get_ts(&ent->ts2); > memcpy(ent->out->first.data, ent->lay->out, sizeof(ent->lay->out)); > dump_command(dev, ent, 0); > @@ -1136,10 +1142,7 @@ void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, unsigned long vector) > } else { > complete(&ent->done); > } > - if (ent->page_queue) > - up(&cmd->pages_sem); > - else > - up(&cmd->sem); > + up(sem); > } > } > } > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html