[PATCH net-next] sock: propagate __sock_cmsg_send() error

[Eric Dumazet]

From: Eric Dumazet <eduma...@google.com>

__sock_cmsg_send() might return different error codes, not only -EINVAL.

Fixes: 24025c465f77 ("ipv4: process socket-level control messages in IPv4")
Fixes: ad1e46a83716 ("ipv6: process socket-level control messages in IPv6")
Signed-off-by: Eric Dumazet <eduma...@google.com>
Cc: Soheil Hassas Yeganeh <soh...@google.com>
---
 net/ipv4/ip_sockglue.c |    5 +++--
 net/ipv6/datagram.c    |    5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 
5805762d7fc79a702f1d67e802992b822f66f000..71a52f4d4cffba2db9353f43dc817689bf4fab10
 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -247,8 +247,9 @@ int ip_cmsg_send(struct sock *sk, struct msghdr *msg, 
struct ipcm_cookie *ipc,
                }
 #endif
                if (cmsg->cmsg_level == SOL_SOCKET) {
-                       if (__sock_cmsg_send(sk, msg, cmsg, &ipc->sockc))
-                               return -EINVAL;
+                       err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
+                       if (err)
+                               return err;
                        continue;
                }
 
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index 
00d0c2903173a96571983216f2839a93059cad22..37874e2f30edf98f31e2a5097761143d507d5b95
 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -746,8 +746,9 @@ int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
                }
 
                if (cmsg->cmsg_level == SOL_SOCKET) {
-                       if (__sock_cmsg_send(sk, msg, cmsg, sockc))
-                               return -EINVAL;
+                       err = __sock_cmsg_send(sk, msg, cmsg, sockc);
+                       if (err)
+                               return err;
                        continue;
                }