clnt_dg: Fix infinite loop when datagram call times out

After an RPC over datagram call times out, clnt_dg_call() goes into a
loop, spamming the server with endless retransmits.  Since signals
are masked, a ^C doesn't break the loop -- the process must be KILLed.

Add missing logic to exit appropriately after the call's total time
has expired.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/clnt_dg.c b/src/clnt_dg.c
index 2eeaada..2f870b1 100644
--- a/src/clnt_dg.c
+++ b/src/clnt_dg.c
@@ -381,6 +381,10 @@ call_again:
 	}
 
 send_again:
+	if (total_time <= 0) {
+		cu->cu_error.re_status = RPC_TIMEDOUT;
+		goto out;
+	}
 	nextsend_time = cu->cu_wait.tv_sec * 1000 + cu->cu_wait.tv_usec / 1000;
 	if (sendto(cu->cu_fd, cu->cu_outbuf, outlen, 0, sa, salen) != outlen) {
 		cu->cu_error.re_errno = errno;