Merge pull request #10891 from lahwaacz/markdown-fix-overflow

Fix buffer overflow in Markdown parser

Author: doxygen

src/markdown.cpp

@@ -661,6 +661,11 @@ size_t Markdown::Private::findEmphasisChar(std::string_view data, char c, size_t
                      data[i]!='\\' && data[i]!='@' &&
                      !(data[i]=='/' && data[i-1]=='<') && // html end tag also ends emphasis
                      data[i]!='\n') i++;
+    // avoid overflow (unclosed emph token)
+    if (i==size)
+    {
+      return 0;
+    }
     //printf("findEmphasisChar: data=[%s] i=%d c=%c\n",data,i,data[i]);
 
     // not counting escaped chars or characters that are unlikely