check_curl: abort redir if location is not found

This commit changes the behaviour of check_curl slightly.
Previously when the redirection method was set to the old 'check_http'
style redirection and there was no "location" header in the original
answer 'check_curl' segfaulted.
Now, at least it dies properly with a message.

1 files changed, 5 insertions, 0 deletions

diff --git a/plugins/check_curl.c b/plugins/check_curl.c
index fc704171..4eaa5f1d 100644
--- a/plugins/check_curl.c
+++ b/plugins/check_curl.c
@@ -672,6 +672,11 @@ redir_wrapper redir(curlhelp_write_curlbuf *header_buf, const check_curl_config
 
         char *location = get_header_value(headers, nof_headers, "location");
 
+        if (location == NULL) {
+                // location header not found
+                die(STATE_UNKNOWN, "HTTP UNKNOWN - could not find \"location\" header\n");
+        }
+
         if (verbose >= 2) {
                 printf(_("* Seen redirect location %s\n"), location);
         }