File curl-CVE-2024-2398.patch of Package curl.35519

From deca8039991886a559b67bcd6701db800a5cf764 Mon Sep 17 00:00:00 2001
From: Stefan Eissing <stefan@eissing.org>
Date: Wed, 6 Mar 2024 09:36:08 +0100
Subject: [PATCH] http2: push headers better cleanup

- provide common cleanup method for push headers

Closes #13054
---
 lib/http2.c | 34 +++++++++++++++-------------------
 1 file changed, 15 insertions(+), 19 deletions(-)

Index: curl-7.66.0/lib/http2.c
===================================================================
--- curl-7.66.0.orig/lib/http2.c
+++ curl-7.66.0/lib/http2.c
@@ -516,6 +516,14 @@ static struct Curl_easy *duphandle(struc
   return second;
 }
 
+static void free_push_headers(struct HTTP *stream)
+{
+  size_t i;
+  for(i = 0; i<stream->push_headers_used; i++)
+    free(stream->push_headers[i]);
+  Curl_safefree(stream->push_headers);
+  stream->push_headers_used = 0;
+}
 
 static int push_promise(struct Curl_easy *data,
                         struct connectdata *conn,
@@ -530,7 +538,6 @@ static int push_promise(struct Curl_easy
     struct curl_pushheaders heads;
     CURLMcode rc;
     struct http_conn *httpc;
-    size_t i;
     /* clone the parent */
     struct Curl_easy *newhandle = duphandle(data);
     if(!newhandle) {
@@ -559,11 +566,7 @@ static int push_promise(struct Curl_easy
     Curl_set_in_callback(data, false);
 
     /* free the headers again */
-    for(i = 0; i<stream->push_headers_used; i++)
-      free(stream->push_headers[i]);
-    free(stream->push_headers);
-    stream->push_headers = NULL;
-    stream->push_headers_used = 0;
+    free_push_headers(stream);
 
     if(rv) {
       /* denied, kill off the new handle again */
@@ -993,11 +999,17 @@ static int on_header(nghttp2_session *se
     else if(stream->push_headers_used ==
             stream->push_headers_alloc) {
       char **headp;
+	  if(stream->push_headers_alloc > 1000) {
+        /* this is beyond crazy many headers, bail out */
+        failf(data_s, "Too many PUSH_PROMISE headers");
+        free_push_headers(stream);
+        return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
+      }
       stream->push_headers_alloc *= 2;
-      headp = Curl_saferealloc(stream->push_headers,
-                               stream->push_headers_alloc * sizeof(char *));
+      headp = realloc(stream->push_headers,
+                      stream->push_headers_alloc * sizeof(char *));
       if(!headp) {
-        stream->push_headers = NULL;
+        free_push_headers(stream);
         return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
       }
       stream->push_headers = headp;