[PATCH 1/1] In socket_recv_thread(), don't try to iov_append() a NULL buffer.

[Chris Kirby]

Signed-off-by: Chris Kirby <ckirby at versity.com>
---
 shared/mtr-socket.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/shared/mtr-socket.c b/shared/mtr-socket.c
index 3794c0f..e6d520d 100644
--- a/shared/mtr-socket.c
+++ b/shared/mtr-socket.c
@@ -212,7 +212,10 @@ static void socket_recv_thread(struct thread *thr, void *arg)
 		}
 
 		iovcnt = iov_append(iov, 0, page_address(ctl_page), mdesc.ctl_size);
-		iovcnt = iov_append(iov, iovcnt, page_address(mdesc.data_page), mdesc.data_size);
+
+		if (mdesc.data_size) {
+			iovcnt = iov_append(iov, iovcnt, page_address(mdesc.data_page), mdesc.data_size);
+		}
 
 		ret = whole_iovec(readv, pinf->fd, iov, iovcnt);
 		if (ret < 0)
-- 
2.39.5 (Apple Git-154)