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[89.177.130.96]) by smtp.gmail.com with ESMTPSA id f1sm12197579wro.85.2020.02.22.22.43.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 22 Feb 2020 22:43:30 -0800 (PST) Date: Sun, 23 Feb 2020 07:43:29 +0100 From: Jiri Pirko To: madhuparnabhowmik10@gmail.com Message-ID: <20200223064329.GD2228@nanopsycho> References: <20200222065234.8829-1-madhuparnabhowmik10@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200222065234.8829-1-madhuparnabhowmik10@gmail.com> Cc: paulmck@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, jiri@mellanox.com, joel@joelfernandes.org, linux-kernel-mentees@lists.linuxfoundation.org, davem@davemloft.net Subject: Re: [Linux-kernel-mentees] [PATCH] net: core: devlink.c: Hold devlink->lock from the beginning of devlink_dpipe_table_register() X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" Sat, Feb 22, 2020 at 07:52:34AM CET, madhuparnabhowmik10@gmail.com wrote: >From: Madhuparna Bhowmik > >devlink_dpipe_table_find() should be called under either >rcu_read_lock() or devlink->lock. devlink_dpipe_table_register() >calls devlink_dpipe_table_find() without holding the lock >and acquires it later. Therefore hold the devlink->lock >from the beginning of devlink_dpipe_table_register(). > >Suggested-by: Jiri Pirko >Signed-off-by: Madhuparna Bhowmik >--- > net/core/devlink.c | 15 +++++++++++---- > 1 file changed, 11 insertions(+), 4 deletions(-) > >diff --git a/net/core/devlink.c b/net/core/devlink.c >index 3e8c94155d93..ba9dd8cb98c3 100644 >--- a/net/core/devlink.c >+++ b/net/core/devlink.c >@@ -6840,22 +6840,29 @@ int devlink_dpipe_table_register(struct devlink *devlink, > { > struct devlink_dpipe_table *table; > >- if (devlink_dpipe_table_find(&devlink->dpipe_table_list, table_name)) >+ mutex_lock(&devlink->lock); >+ >+ if (devlink_dpipe_table_find(&devlink->dpipe_table_list, table_name)) { >+ mutex_unlock(&devlink->lock); > return -EEXIST; >+ } > >- if (WARN_ON(!table_ops->size_get)) >+ if (WARN_ON(!table_ops->size_get)) { >+ mutex_unlock(&devlink->lock); > return -EINVAL; >+ } > > table = kzalloc(sizeof(*table), GFP_KERNEL); >- if (!table) >+ if (!table) { >+ mutex_unlock(&devlink->lock); Please use "goto unlock" instead of unlocking on multiple places. > return -ENOMEM; >+ } > > table->name = table_name; > table->table_ops = table_ops; > table->priv = priv; > table->counter_control_extern = counter_control_extern; > >- mutex_lock(&devlink->lock); > list_add_tail_rcu(&table->list, &devlink->dpipe_table_list); > mutex_unlock(&devlink->lock); > return 0; >-- >2.17.1 > _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees