From 80b6cd92af1891d9645923db3bbd453c99e99d45 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Tue, 17 Mar 2026 16:22:54 +0100
Subject: [PATCH] tool_formparse: propagate my_get_line errors when reading
 headers

The read_field_headers() function would return "ok" even if the
underlying file read returned error, thus would the parent not become
aware of the problem.

Follow-up to f847d2ed0244319ee6b5e9b054c

Found by Codex Security

Closes #20963
---
 src/tool_formparse.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/tool_formparse.c b/src/tool_formparse.c
index 3760419fd9..0845e0c0f5 100644
--- a/src/tool_formparse.c
+++ b/src/tool_formparse.c
@@ -464,6 +464,10 @@ static int read_field_headers(FILE *fp, struct curl_slist **pheaders)
       break;
     }
   }
+  if(error && !err) {
+    errorf("Failed to read field headers");
+    err = -1;
+  }
   curlx_dyn_free(&line);
   return err;
 }