[PATCH 2/2] netfilter: nft_socket: fix build with CONFIG_SOCK_CGROUP_DATA=n

Arnd Bergmann
2021-04-27T19:46:02Z

From: Arnd Bergmann <arnd@arndb.de>

In some configurations, the sock_cgroup_ptr() function is not available:

net/netfilter/nft_socket.c: In function 'nft_sock_get_eval_cgroupv2':
net/netfilter/nft_socket.c:47:16: error: implicit declaration of function 'sock_cgroup_ptr'; did you mean 'obj_cgroup_put'? [-Werror=implicit-function-declaration]
47 | cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
| ^~~~~~~~~~~~~~~
| obj_cgroup_put
net/netfilter/nft_socket.c:47:14: error: assignment to 'struct cgroup *' from 'int' makes pointer from integer without a cast [-Werror=int-conversion]
47 | cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
| ^

Change the caller to match the same #ifdef check, only calling it
when the function is defined.

Fixes: e0bb96db96f8 ("netfilter: nft_socket: add support for cgroupsv2")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
I don't actually know what the right fix is for this, I only checked
that my patch fixes the build failure. Is is possible that the function
should always be defined.

Please make sure you review carefully before applying.
---
net/netfilter/nft_socket.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nft_socket.c b/net/netfilter/nft_socket.c
index f9c5ff6024e0..d601974c9d2e 100644
--- a/net/netfilter/nft_socket.c
+++ b/net/netfilter/nft_socket.c
@@ -34,7 +34,7 @@ static void nft_socket_wildcard(const struct nft_pktinfo *pkt,
}
}

-#ifdef CONFIG_CGROUPS
+#ifdef CONFIG_SOCK_CGROUP_DATA
static noinline bool
nft_sock_get_eval_cgroupv2(u32 *dest, const struct nft_pktinfo *pkt, u32 level)
{
@@ -106,7 +106,7 @@ static void nft_socket_eval(const struct nft_expr *expr,
}
nft_socket_wildcard(pkt, regs, sk, dest);
break;
-#ifdef CONFIG_CGROUPS
+#ifdef CONFIG_SOCK_CGROUP_DATA
case NFT_SOCKET_CGROUPV2:
if (!nft_sock_get_eval_cgroupv2(dest, pkt, priv->level)) {
regs->verdict.code = NFT_BREAK;
--
2.29.2