https://bugs.gentoo.org/924017
https://github.com/curl/curl/pull/12848

From ed09a99af57200643d5ae001e815eeab9ffe3f84 Mon Sep 17 00:00:00 2001
From: Stefan Eissing <stefan@eissing.org>
Date: Thu, 1 Feb 2024 18:15:50 +0100
Subject: [PATCH] vtls: revert "receive max buffer" + add test case

- add test_05_04 for requests using http/1.0, http/1.1 and h2 against an
  Apache resource that does an unclean TLS shutdown.
- revert special workarund in openssl.c for suppressing shutdown errors
  on multiplexed connections
- vlts.c restore to its state before 9a90c9dd64d2f03601833a70786d485851bd1b53

Fixes #12885
Fixes #12844

Closes #12848
---
 lib/vtls/vtls.c | 27 ++++++---------------------
 1 file changed, 6 insertions(+), 21 deletions(-)

diff --git a/lib/vtls/vtls.c b/lib/vtls/vtls.c
index e928ba5d0..f654a9749 100644
--- a/lib/vtls/vtls.c
+++ b/lib/vtls/vtls.c
@@ -1715,32 +1715,17 @@ static ssize_t ssl_cf_recv(struct Curl_cfilter *cf,
 {
   struct cf_call_data save;
   ssize_t nread;
-  size_t ntotal = 0;
 
   CF_DATA_SAVE(save, cf, data);
   *err = CURLE_OK;
-  /* Do receive until we fill the buffer somehwhat or EGAIN, error or EOF */
-  while(!ntotal || (len - ntotal) > (4*1024)) {
+  nread = Curl_ssl->recv_plain(cf, data, buf, len, err);
+  if(nread > 0) {
+    DEBUGASSERT((size_t)nread <= len);
+  }
+  else if(nread == 0) {
+    /* eof */
     *err = CURLE_OK;
-    nread = Curl_ssl->recv_plain(cf, data, buf + ntotal, len - ntotal, err);
-    if(nread < 0) {
-      if(*err == CURLE_AGAIN && ntotal > 0) {
-        /* we EAGAINed after having reed data, return the success amount */
-        *err = CURLE_OK;
-        break;
-      }
-      /* we have a an error to report */
-      goto out;
-    }
-    else if(nread == 0) {
-      /* eof */
-      break;
-    }
-    ntotal += (size_t)nread;
-    DEBUGASSERT((size_t)ntotal <= len);
   }
-  nread = (ssize_t)ntotal;
-out:
   CURL_TRC_CF(data, cf, "cf_recv(len=%zu) -> %zd, %d", len,
               nread, *err);
   CF_DATA_RESTORE(cf, save);
-- 
2.43.0