From d0b1cf88e38ff72ea7b5c54ff94b22f1bb8080d7 Mon Sep 17 00:00:00 2001
From: David Bar-On <david.cdb004@gmail.com>
Date: Sun, 2 Jun 2024 12:48:08 +0300
Subject: [PATCH] Add check that size is positive

---
 src/iperf_api.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/iperf_api.c b/src/iperf_api.c
index c4d455cba..aa724e93d 100644
--- a/src/iperf_api.c
+++ b/src/iperf_api.c
@@ -2730,7 +2730,7 @@ JSON_read(int fd)
      */
     rc = Nread(fd, (char*) &nsize, sizeof(nsize), Ptcp);
     hsize = ntohl(nsize);
-    if (rc == sizeof(nsize) && hsize <= MAX_PARAMS_JSON_STRING) {
+    if (rc == sizeof(nsize) && hsize > 0 && hsize <= MAX_PARAMS_JSON_STRING) {
 	/* Allocate a buffer to hold the JSON */
 	strsize = hsize + 1;              /* +1 for trailing NULL */
 	if (strsize) {