http2: push headers better cleanup

Resolves: RHEL-29809

0038-curl-7.76.1-CVE-2024-2398.patch

@@ -0,0 +1,80 @@
+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(-)
+
+diff --git a/lib/http2.c b/lib/http2.c
+index c63ecd38371ab4..96868728a53a1f 100644
+--- a/lib/http2.c
++++ b/lib/http2.c
+@@ -271,6 +271,15 @@ static CURLcode http2_data_setup(struct Curl_cfilter *cf,
+   return bitmap;
+ }
+ 
++static void free_push_headers(struct HTTP *http)
++{
++  size_t i;
++  for(i = 0; i<http->push_headers_used; i++)
++    free(http->push_headers[i]);
++  Curl_safefree(http->push_headers);
++  http->push_headers_used = 0;
++}
++
+ /*
+  * http2_stream_free() free HTTP2 stream related data
+  */
+@@ -306,11 +315,7 @@ static void http2_data_done(struct Curl_cfilter *cf,
+ {
+   if(http) {
+     Curl_dyn_free(&http->header_recvbuf);
+-    for(; http->push_headers_used > 0; --http->push_headers_used) {
+-      free(http->push_headers[http->push_headers_used - 1]);
+-    }
+-    free(http->push_headers);
+-    http->push_headers = NULL;
++    free_push_headers(http);
+   }
+ }
+ 
+@@ -860,7 +861,6 @@ static int push_promise(struct Curl_cfilter *cf,
+     struct curl_pushheaders heads;
+     CURLMcode rc;
+     struct http_conn *httpc;
+-    size_t i;
+     /* clone the parent */
+     struct Curl_easy *newhandle = duphandle(data);
+     if(!newhandle) {
+@@ -905,11 +905,7 @@ static int push_promise(struct Curl_cfilter *cf,
+     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) {
+       DEBUGASSERT((rv > CURL_PUSH_OK) && (rv <= CURL_PUSH_ERROROUT));
+@@ -1426,10 +1422,10 @@ static int on_header(nghttp2_session *session, const nghttp2_frame *frame,
+             stream->push_headers_alloc) {
+       char **headp;
+       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;

curl.spec

@@ -1,7 +1,7 @@
 Summary: A utility for getting files from remote servers (FTP, HTTP, and others)
 Name: curl
 Version: 7.76.1
-Release: 30%{?dist}
+Release: 31%{?dist}
 License: MIT
 Source: https://curl.se/download/%{name}-%{version}.tar.xz
 
@@ -113,6 +113,9 @@ Patch36:  0036-curl-7.76.1-CVE-2023-46218.patch
 # ignore unexpected EOF (RHEL-39995)
 Patch37:  0037-curl-7.76.1-ignore-unexpected-eof.patch
 
+# provide common cleanup method for push headers (CVE-2024-2398)
+Patch38:  0038-curl-7.76.1-CVE-2024-2398.patch
+
 # patch making libcurl multilib ready
 Patch101: 0101-curl-7.32.0-multilib.patch
 
@@ -324,6 +327,7 @@ be installed.
 %patch35 -p1
 %patch36 -p1
 %patch37 -p1
+%patch38 -p1
 
 # Fedora patches
 %patch101 -p1
@@ -582,6 +586,9 @@ rm -f ${RPM_BUILD_ROOT}%{_libdir}/libcurl.la
 %{_libdir}/libcurl.so.4.[0-9].[0-9].minimal
 
 %changelog
+* Thu Aug 22 2024 Jacek Migacz <jmigacz@redhat.com> - 7.76.1-31
+- provide common cleanup method for push headers (CVE-2024-2398)
+
 * Tue Jun 18 2024 Jacek Migacz <jmigacz@redhat.com> - 7.76.1-30
 - ignore unexpected EOF (RHEL-39995)