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authorKees Cook <keescook@chromium.org>2022-05-08 13:22:17 +0300
committerPaolo Abeni <pabeni@redhat.com>2022-05-10 13:21:51 +0300
commitdc5306a8c0eace6c113aded2e36ae5e15fdca4d7 (patch)
tree9871932c6b1920bdf99797282deb89d92f2de435 /net/decnet
parent1809c30b6e5a83a1de1435fe01aaa4de4d626a7c (diff)
downloadlinux-dc5306a8c0eace6c113aded2e36ae5e15fdca4d7.tar.xz
decnet: Use container_of() for struct dn_neigh casts
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 <lkp@intel.com> Link: https://lore.kernel.org/lkml/202205041247.WKBEHGS5-lkp@intel.com Cc: "David S. Miller" <davem@davemloft.net> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Paolo Abeni <pabeni@redhat.com> Cc: Yajun Deng <yajun.deng@linux.dev> Cc: Zheng Yongjun <zhengyongjun3@huawei.com> Cc: Bill Wendling <morbo@google.com> Cc: linux-decnet-user@lists.sourceforge.net Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220508102217.2647184-1-keescook@chromium.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/decnet')
-rw-r--r--net/decnet/dn_dev.c4
-rw-r--r--net/decnet/dn_neigh.c3
-rw-r--r--net/decnet/dn_route.c4
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 @@ source_ok:
/* 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;
}