From: Kees Cook <keescook@chromium.org>
To: "David S. Miller" <davem@davemloft.net>
Cc: Kees Cook <keescook@chromium.org>,
kernel test robot <lkp@intel.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Yajun Deng <yajun.deng@linux.dev>,
Zheng Yongjun <zhengyongjun3@huawei.com>,
Bill Wendling <morbo@google.com>,
linux-decnet-user@lists.sourceforge.net, netdev@vger.kernel.org,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Tom Rix <trix@redhat.com>,
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 [thread overview]
Message-ID: <20220508102217.2647184-1-keescook@chromium.org> (raw)
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>
---
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
next reply other threads:[~2022-05-08 10:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-08 10:22 Kees Cook [this message]
2022-05-10 10:40 ` [PATCH] decnet: Use container_of() for struct dn_neigh casts patchwork-bot+netdevbpf
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220508102217.2647184-1-keescook@chromium.org \
--to=keescook@chromium.org \
--cc=davem@davemloft.net \
--cc=kuba@kernel.org \
--cc=linux-decnet-user@lists.sourceforge.net \
--cc=linux-kernel@vger.kernel.org \
--cc=lkp@intel.com \
--cc=morbo@google.com \
--cc=nathan@kernel.org \
--cc=ndesaulniers@google.com \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=trix@redhat.com \
--cc=yajun.deng@linux.dev \
--cc=zhengyongjun3@huawei.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).