kc3-lang/libxml2/test/XInclude/docs/fallback5.xml

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• Hash : 1abf2967
  Author :
  Date : 2020-08-06T17:51:57
  

  Fix exponential runtime and memory in xi:fallback processing
  
  When creating XML_XINCLUDE_START nodes, the children of the original
  xi:include node must be freed, otherwise fallback content is copied
  twice, doubling runtime and memory consumption for each nested
  xi:fallback/xi:include pair.
  
  Found with libFuzzer.
  

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• test/XInclude/docs/fallback5.xml

• <a>
   <xi:include href="a01.xml" xmlns:xi="http://www.w3.org/2001/XInclude">
    <xi:fallback>
     <elem/>
     <xi:include href="a02.xml">
      <xi:fallback>
       <elem/>
       <xi:include href="a03.xml">
        <xi:fallback>
         <elem/>
         <xi:include href="a04.xml">
          <xi:fallback>
           <elem/>
           <xi:include href="a05.xml">
            <xi:fallback>
             <elem/>
             <xi:include href="a06.xml">
              <xi:fallback>
               <elem/>
               <xi:include href="a07.xml">
                <xi:fallback>
                 <elem/>
                 <xi:include href="a08.xml">
                  <xi:fallback>
                   <elem/>
                   <xi:include href="a09.xml">
                    <xi:fallback>
                     <elem/>
                     <xi:include href="a10.xml">
                      <xi:fallback>
                       <elem/>
                       <xi:include href="a11.xml">
                        <xi:fallback>
                         <elem/>
                         <xi:include href="a12.xml">
                          <xi:fallback>
                           <elem/>
                           <xi:include href="a13.xml">
                            <xi:fallback>
                             <elem/>
                             <xi:include href="a14.xml">
                              <xi:fallback>
                               <elem/>
                               <xi:include href="a15.xml">
                                <xi:fallback>
                                 <elem/>
                                 <xi:include href="a16.xml">
                                  <xi:fallback>
                                   <elem/>
                                  </xi:fallback>
                                 </xi:include>
                                </xi:fallback>
                               </xi:include>
                              </xi:fallback>
                             </xi:include>
                            </xi:fallback>
                           </xi:include>
                          </xi:fallback>
                         </xi:include>
                        </xi:fallback>
                       </xi:include>
                      </xi:fallback>
                     </xi:include>
                    </xi:fallback>
                   </xi:include>
                  </xi:fallback>
                 </xi:include>
                </xi:fallback>
               </xi:include>
              </xi:fallback>
             </xi:include>
            </xi:fallback>
           </xi:include>
          </xi:fallback>
         </xi:include>
        </xi:fallback>
       </xi:include>
      </xi:fallback>
     </xi:include>
    </xi:fallback>
   </xi:include>
  </a>
  
  

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