flow: fix podman issue #26073

While running pasta, we trigger the following assert:

  ASSERTION FAILED in udp_at_sidx (udp_flow.c:35): flow->f.type == FLOW_UDP

in udp_at_sidx() in the following path:

 902 void udp_sock_handler(const struct ctx *c, union epoll_ref ref,
 903                       uint32_t events, const struct timespec *now)
 904 {
 905         struct udp_flow *uflow = udp_at_sidx(ref.flowside);

The invalid sidx is comming from the epoll_ref provided by epoll_wait().

This assert follows the following error:

  Couldn't connect flow socket: Permission denied

It appears that an error happens in udp_flow_sock() and the recently
created fd is not removed from the epoll_ctl() pool:

 71 static int udp_flow_sock(const struct ctx *c,
 72                          struct udp_flow *uflow, unsigned sidei)
 73 {
...
 82         s = flowside_sock_l4(c, EPOLL_TYPE_UDP, pif, side, fref.data);
 83         if (s < 0) {
 84                 flow_dbg_perror(uflow, "Couldn't open flow specific socket");
 85                 return s;
 86         }
 87
 88         if (flowside_connect(c, s, pif, side) < 0) {
 89                 int rc = -errno;
 90                 flow_dbg_perror(uflow, "Couldn't connect flow socket");
 91                 return rc;
 92         }
...

flowside_sock_l4() calls sock_l4_sa() that adds 's' to the epoll_ctl()
pool.

So to cleanly manage the error of flowside_connect() we need to remove
's' from the epoll_ctl() pool using epoll_del().

Link: https://github.com/containers/podman/issues/26073
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

udp_flow.c

@@ -87,6 +87,10 @@ static int udp_flow_sock(const struct ctx *c,
 
 	if (flowside_connect(c, s, pif, side) < 0) {
 		int rc = -errno;
+
+		if (pif == PIF_HOST)
+			epoll_del(c, s);
+
 		flow_dbg_perror(uflow, "Couldn't connect flow socket");
 		return rc;
 	}