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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id 24-20020a630e58000000b003c18e0768e3sm6282253pgo.78.2022.05.08.03.22.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 May 2022 03:22:19 -0700 (PDT) From: Kees Cook To: "David S. Miller" Cc: Kees Cook , kernel test robot , Jakub Kicinski , Paolo Abeni , Yajun Deng , Zheng Yongjun , Bill Wendling , linux-decnet-user@lists.sourceforge.net, netdev@vger.kernel.org, Nathan Chancellor , Nick Desaulniers , Tom Rix , linux-kernel@vger.kernel.org Subject: [PATCH] decnet: Use container_of() for struct dn_neigh casts Date: Sun, 8 May 2022 03:22:17 -0700 Message-Id: <20220508102217.2647184-1-keescook@chromium.org> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3446; h=from:subject; bh=+l+yjvSlQG66hH93c6GLUCBvIJkg4CiTdFELRDIUpus=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBid5nY2cRLINCQ2bxt6khjCjuNWu+eOO2gv5Cl0wzw th3zU8CJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYneZ2AAKCRCJcvTf3G3AJgA+D/ 99aMbeAf2ZnQJxiBaIcRp9TVABSr4pX4tbVz/S4fIM7Ctp23atFcCOQq2PeFiTPe+cWUySseRxk5q1 /DK1g91/2vHBE4MJwjTaZis9Kx1U/CMHkaNWuVD4c78p5Cdkxm7OKXMOpJU02nlKfgVjlJn+86gkdK opQyBNrR6NRGOT7lHKfbTzdV8FTKmpHYUT93tOrIOAkJj0lrEbucbcf5zZ5irLP7XGlmYyMY52E2k4 /noPIO9vAhG7qn0rJKurfHG1VpkCs65B45dWhwQah8D2CK9/t6PBVmv26t8PWGAeg4ZkvqtKrNA3u9 aDHq/yKpCNastOvqs9Ll6SZez3z78N6Ym0vbcynIklLdQsZJAuovTtDug+vnjU0JpPd98Wh5fpjNvd pxEecRYGRCxtlQUdvjzfi7oHZmr9kLrHfln8j0N977N9eIc70FK3xBvG91+72uFL22XQcnnhjPzDSh lMLMOhQ+EUj0oQTmrFvc1n9a9zGSNRm5ho6qu5CueRiEHKTA2Lh4GTf/M5gZR/dA9Pjh6ELQgAK2jP BN1XDqsthpCiNyygRkBW0//44TgSouu5dE8blVHNbIVs+9Z9k932kn1Vc9w9tKWTUeqN9s99s2VEZJ KKaiLgqNjckzMzHC19Zugc36Wc0Cpv8tQnzyZ7+ZB8lv7LzBlDJKw8sZiM1w== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Clang's structure layout randomization feature gets upset when it sees struct neighbor (which is randomized) cast to struct dn_neigh: net/decnet/dn_route.c:1123:15: error: casting from randomized structure pointer type 'struct neighbour *' to 'struct dn_neigh *' gateway = ((struct dn_neigh *)neigh)->addr; ^ Update all the open-coded casts to use container_of() to do the conversion instead of depending on strict member ordering. Reported-by: kernel test robot Link: https://lore.kernel.org/lkml/202205041247.WKBEHGS5-lkp@intel.com Cc: "David S. Miller" Cc: Jakub Kicinski Cc: Paolo Abeni Cc: Yajun Deng Cc: Zheng Yongjun Cc: Bill Wendling Cc: linux-decnet-user@lists.sourceforge.net Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- net/decnet/dn_dev.c | 4 ++-- net/decnet/dn_neigh.c | 3 ++- net/decnet/dn_route.c | 4 ++-- 3 files changed, 6 insertions(+), 5 deletions(-) diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c index 0ee7d4c0c955..a09ba642b5e7 100644 --- a/net/decnet/dn_dev.c +++ b/net/decnet/dn_dev.c @@ -854,7 +854,7 @@ static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa) memcpy(msg->neighbor, dn_hiord, ETH_ALEN); if (dn_db->router) { - struct dn_neigh *dn = (struct dn_neigh *)dn_db->router; + struct dn_neigh *dn = container_of(dn_db->router, struct dn_neigh, n); dn_dn2eth(msg->neighbor, dn->addr); } @@ -902,7 +902,7 @@ static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa) { int n; struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); - struct dn_neigh *dn = (struct dn_neigh *)dn_db->router; + struct dn_neigh *dn = container_of(dn_db->router, struct dn_neigh, n); struct sk_buff *skb; size_t size; unsigned char *ptr; diff --git a/net/decnet/dn_neigh.c b/net/decnet/dn_neigh.c index 94b306f6d551..fbd98ac853ea 100644 --- a/net/decnet/dn_neigh.c +++ b/net/decnet/dn_neigh.c @@ -426,7 +426,8 @@ int dn_neigh_router_hello(struct net *net, struct sock *sk, struct sk_buff *skb) if (!dn_db->router) { dn_db->router = neigh_clone(neigh); } else { - if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority) + if (msg->priority > container_of(dn_db->router, + struct dn_neigh, n)->priority) neigh_release(xchg(&dn_db->router, neigh_clone(neigh))); } } diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c index 7e85f2a1ae25..d1d78a463a06 100644 --- a/net/decnet/dn_route.c +++ b/net/decnet/dn_route.c @@ -1120,7 +1120,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *o /* Ok then, we assume its directly connected and move on */ select_source: if (neigh) - gateway = ((struct dn_neigh *)neigh)->addr; + gateway = container_of(neigh, struct dn_neigh, n)->addr; if (gateway == 0) gateway = fld.daddr; if (fld.saddr == 0) { @@ -1429,7 +1429,7 @@ static int dn_route_input_slow(struct sk_buff *skb) /* Use the default router if there is one */ neigh = neigh_clone(dn_db->router); if (neigh) { - gateway = ((struct dn_neigh *)neigh)->addr; + gateway = container_of(neigh, struct dn_neigh, n)->addr; goto make_route; } -- 2.32.0