Check return code of fcntl() in several plaaces

Fixes: CID#307539, CID#307533
Change-Id: I46843174eb4699a59421dc3f3b900a3894c67081
---
M src/ctl.c
M src/proto_clnt.c
2 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/src/ctl.c b/src/ctl.c
index 54d37c5..8ed4a69 100644
--- a/src/ctl.c
+++ b/src/ctl.c
@@ -163,9 +163,20 @@
 	}
 
 	int flags = fcntl(ts->fd, F_GETFL);
-	fcntl(ts->fd, F_SETFL, flags | O_NONBLOCK);
+	if (flags < 0)
+		goto out_err;
+
+	ret = fcntl(ts->fd, F_SETFL, flags | O_NONBLOCK);
+	if (ret < 0)
+		goto out_err;
 
 	return sd[1];
+out_err:
+	close(sd[0]);
+	close(sd[1]);
+	ts->fd = -1;
+	ts->mode = E1_TS_MODE_OFF;
+	return -1;
 }
 
 
diff --git a/src/proto_clnt.c b/src/proto_clnt.c
index 6c59593..93853e9 100644
--- a/src/proto_clnt.c
+++ b/src/proto_clnt.c
@@ -189,7 +189,12 @@
 
 	/* Response */
 	int flags = fcntl(clnt->ctl_fd.fd, F_GETFL, 0);
-	fcntl(clnt->ctl_fd.fd, F_SETFL, flags & ~O_NONBLOCK);
+	if (flags < 0)
+		return -EIO;
+
+	rc = fcntl(clnt->ctl_fd.fd, F_SETFL, flags & ~O_NONBLOCK);
+	if (rc < 0)
+		goto err;
 
 	while (1) {
 		fd = -1;
@@ -207,7 +212,11 @@
 		msgb_free(msgb);
 	}
 
-	fcntl(clnt->ctl_fd.fd, F_SETFL, flags);
+	rc = fcntl(clnt->ctl_fd.fd, F_SETFL, flags);
+	if (rc < 0) {
+		rc = -EIO;
+		goto err;
+	}
 
 	if (msg_hdr->type != (hdr->type | E1DP_RESP_TYPE)) {
 		rc = -EPIPE;

