[PATCH v2] ubusd: fix disconnection when sending invalid fd

[adrian.frances at netduma.com]

From: Adrian Frances <adrian.frances at netduma.com>

According to man 7 unix, sendmsg returns EBADF when sending an
invalid file descriptor as ancillary data. The patch avois ubus
disconnecting the client when EBADF is received for the mentioned
case.

Signed-off-by: Adrian Frances <adrian.frances at netduma.com>
---
 ubusd_main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ubusd_main.c b/ubusd_main.c
index d454b1a..35e51e7 100644
--- a/ubusd_main.c
+++ b/ubusd_main.c
@@ -12,6 +12,7 @@
 #endif
 #include <string.h>
 #include <syslog.h>
+#include <fcntl.h>
 
 #include <libubox/usock.h>
 
@@ -67,6 +68,12 @@ static void client_cb(struct uloop_fd *sock, unsigned int events)
 			case EINTR:
 			case EAGAIN:
 				break;
+			case EBADF:
+				if(fcntl(sock->fd, F_GETFD) != -1) {
+					cl->txq_ofs = 0;
+					ubus_msg_list_free(ubl);
+					continue;
+				}
 			default:
 				goto disconnect;
 			}
-- 
2.25.1