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From 9d5903ebcbcbcc4f3a997ec7d5552721c5383b9f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Ba=C5=A1ti?= <mbasti@redhat.com>
Date: Thu, 27 Aug 2020 23:09:56 +0200
Subject: [PATCH] http_proxy: do not crash with HTTPS_PROXY and NO_PROXY set

... in case NO_PROXY takes an effect

Without this patch, the following command crashes:

    $ GIT_CURL_VERBOSE=1 NO_PROXY=github.com HTTPS_PROXY=https://example.com \
        git clone https://github.com/curl/curl.git

Minimal libcurl-based reproducer:

    #include <curl/curl.h>

    int main() {
      CURL *curl = curl_easy_init();
      if(curl) {
        CURLcode ret;
        curl_easy_setopt(curl, CURLOPT_URL, "https://github.com/");
        curl_easy_setopt(curl, CURLOPT_PROXY, "example.com");
        /* set the proxy type */
        curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
        curl_easy_setopt(curl, CURLOPT_NOPROXY, "github.com");
        curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
        ret = curl_easy_perform(curl);
        curl_easy_cleanup(curl);
        return ret;
      }
      return -1;
    }

Assisted-by: Kamil Dudka
Bug: https://bugzilla.redhat.com/1873327
Closes #5902

Upstream-commit: 3eff1c5092e542819ac7e6454a70c94b36ab2a40
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
 lib/url.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/url.c b/lib/url.c
index d65d17d..e77f391 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -3074,6 +3074,9 @@ static CURLcode create_conn_helper_init_proxy(struct connectdata *conn)
     conn->bits.socksproxy = FALSE;
     conn->bits.proxy_user_passwd = FALSE;
     conn->bits.tunnel_proxy = FALSE;
+    /* CURLPROXY_HTTPS does not have its own flag in conn->bits, yet we need
+       to signal that CURLPROXY_HTTPS is not used for this connection */
+    conn->http_proxy.proxytype = CURLPROXY_HTTP;
   }
 
 out:
-- 
2.25.4