From 79931b2ec7dffc88df4cdd6855d7b1ec95cca20f Mon Sep 17 00:00:00 2001
From: Ivan Nardi <12729895+IvanNardi@users.noreply.github.com>
Date: Sat, 10 Dec 2022 18:31:51 +0100
Subject: Fix undefined-behavior when setting empty user-agent (#1821)

```
ndpi_main.c:9111:35: runtime error: null pointer passed as argument 2, which is declared to never be null
/usr/include/string.h:44:28: note: nonnull attribute specified here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ndpi_main.c:9111:35 in
```
---
 src/lib/ndpi_main.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/lib')

diff --git a/src/lib/ndpi_main.c b/src/lib/ndpi_main.c
index 38820dc0a..7880aeae3 100644
--- a/src/lib/ndpi_main.c
+++ b/src/lib/ndpi_main.c
@@ -9105,6 +9105,9 @@ char *ndpi_user_agent_set(struct ndpi_flow_struct *flow,
     /* Already set: ignore double set */
     return NULL;
   }
+  if(value_len == 0) {
+    return NULL;
+  }
 
   flow->http.user_agent = ndpi_malloc(value_len + 1);
   if(flow->http.user_agent != NULL) {
-- 
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