From 3e5046a370a4eb0d1f2a578f4be7e985ba472de9 Mon Sep 17 00:00:00 2001
From: Eric Covener <covener@apache.org>
Date: Mon, 29 Dec 2014 17:27:46 +0000
Subject: [PATCH] Configuration files with long lines and continuation
 characters are not read properly. PR 55910.

Submitted By: Manuel Mausz <manuel-as mausz.at>
Committed By: covener



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1648394 13f79535-47bb-0310-9956-ffa450edef68
---
 CHANGES       |  3 +++
 server/util.c | 30 +++++++++++++++---------------
 2 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/CHANGES b/CHANGES
index aa18620e41d..2049ac8564a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,9 @@
                                                          -*- coding: utf-8 -*-
 Changes with Apache 2.5.0
 
+  *) core: Configuration files with long lines and continuation characters
+     are not read properly. PR 55910. [Manuel Mausz <manuel-as mausz.at>]
+
   *) mod_proxy_fcgi: Provide some basic alternate options for specifying 
      how PATH_INFO is passed to FastCGI backends by adding significance to
      the value of proxy-fcgi-pathinfo. PR 55329. [Eric Covener]
diff --git a/server/util.c b/server/util.c
index c960248f7e0..c8932a2e772 100644
--- a/server/util.c
+++ b/server/util.c
@@ -971,20 +971,20 @@ AP_DECLARE(const char *) ap_pcfg_strerror(apr_pool_t *p, ap_configfile_t *cfp,
 /* Read one line from open ap_configfile_t, strip LF, increase line number */
 /* If custom handler does not define a getstr() function, read char by char */
 static apr_status_t ap_cfg_getline_core(char *buf, apr_size_t bufsize,
-                                        ap_configfile_t *cfp)
+                                        apr_size_t offset, ap_configfile_t *cfp)
 {
     apr_status_t rc;
     /* If a "get string" function is defined, use it */
     if (cfp->getstr != NULL) {
         char *cp;
-        char *cbuf = buf;
-        apr_size_t cbufsize = bufsize;
+        char *cbuf = buf + offset;
+        apr_size_t cbufsize = bufsize - offset;
 
         while (1) {
             ++cfp->line_number;
             rc = cfp->getstr(cbuf, cbufsize, cfp->param);
             if (rc == APR_EOF) {
-                if (cbuf != buf) {
+                if (cbuf != buf + offset) {
                     *cbuf = '\0';
                     break;
                 }
@@ -1002,11 +1002,11 @@ static apr_status_t ap_cfg_getline_core(char *buf, apr_size_t bufsize,
              */
             cp = cbuf;
             cp += strlen(cp);
-            if (cp > cbuf && cp[-1] == LF) {
+            if (cp > buf && cp[-1] == LF) {
                 cp--;
-                if (cp > cbuf && cp[-1] == CR)
+                if (cp > buf && cp[-1] == CR)
                     cp--;
-                if (cp > cbuf && cp[-1] == '\\') {
+                if (cp > buf && cp[-1] == '\\') {
                     cp--;
                     /*
                      * line continuation requested -
@@ -1024,19 +1024,19 @@ static apr_status_t ap_cfg_getline_core(char *buf, apr_size_t bufsize,
         }
     } else {
         /* No "get string" function defined; read character by character */
-        apr_size_t i = 0;
+        apr_size_t i = offset;
 
         if (bufsize < 2) {
             /* too small, assume caller is crazy */
             return APR_EINVAL;
         }
-        buf[0] = '\0';
+        buf[offset] = '\0';
 
         while (1) {
             char c;
             rc = cfp->getch(&c, cfp->param);
             if (rc == APR_EOF) {
-                if (i > 0)
+                if (i > offset)
                     break;
                 else
                     return APR_EOF;
@@ -1054,11 +1054,11 @@ static apr_status_t ap_cfg_getline_core(char *buf, apr_size_t bufsize,
                     break;
                 }
             }
-            else if (i >= bufsize - 2) {
-                return APR_ENOSPC;
-            }
             buf[i] = c;
             ++i;
+            if (i >= bufsize - 1) {
+                return APR_ENOSPC;
+            }
         }
         buf[i] = '\0';
     }
@@ -1092,7 +1092,7 @@ static int cfg_trim_line(char *buf)
 AP_DECLARE(apr_status_t) ap_cfg_getline(char *buf, apr_size_t bufsize,
                                         ap_configfile_t *cfp)
 {
-    apr_status_t rc = ap_cfg_getline_core(buf, bufsize, cfp);
+    apr_status_t rc = ap_cfg_getline_core(buf, bufsize, 0, cfp);
     if (rc == APR_SUCCESS)
         cfg_trim_line(buf);
     return rc;
@@ -1119,7 +1119,7 @@ AP_DECLARE(apr_status_t) ap_varbuf_cfg_getline(struct ap_varbuf *vb,
     }
 
     for (;;) {
-        rc = ap_cfg_getline_core(vb->buf + vb->strlen, vb->avail - vb->strlen, cfp);
+        rc = ap_cfg_getline_core(vb->buf, vb->avail, vb->strlen, cfp);
         if (rc == APR_ENOSPC || rc == APR_SUCCESS)
             vb->strlen += strlen(vb->buf + vb->strlen);
         if (rc != APR_ENOSPC)
-- 
2.47.3