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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "Gustavo A. R. Silva" Subject: [PATCH v4 7/8] net-device: Use new helpers from overflow.h in netdevice APIs Date: Wed, 28 Feb 2024 22:41:37 +0200 Message-ID: <20240228204919.3680786-8-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.43.0.rc1.1.gbec44491f096 In-Reply-To: <20240228204919.3680786-1-andriy.shevchenko@linux.intel.com> References: <20240228204919.3680786-1-andriy.shevchenko@linux.intel.com> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 We have two new helpers struct_size_with_data() and struct_data_pointer() that we can utilize in alloc_netdev_mqs() and netdev_priv(). Do it so. Signed-off-by: Andy Shevchenko --- include/linux/netdevice.h | 3 ++- net/core/dev.c | 10 +++++----- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index c41019f34179..d046dca18854 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -25,6 +25,7 @@ #include #include #include +#include #include #include #include @@ -2668,7 +2669,7 @@ void dev_net_set(struct net_device *dev, struct net *net) */ static inline void *netdev_priv(const struct net_device *dev) { - return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN); + return struct_data_pointer(dev, NETDEV_ALIGN); } /* Set the sysfs physical device reference for the network logical device diff --git a/net/core/dev.c b/net/core/dev.c index 69c3e3613372..80b765bb8ba2 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -10859,12 +10859,12 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, return NULL; } - alloc_size = sizeof(struct net_device); - if (sizeof_priv) { + if (sizeof_priv) /* ensure 32-byte alignment of private area */ - alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); - alloc_size += sizeof_priv; - } + alloc_size = struct_size_with_data(p, NETDEV_ALIGN, sizeof_priv); + else + alloc_size = sizeof(struct net_device); + /* ensure 32-byte alignment of whole construct */ alloc_size += NETDEV_ALIGN - 1;