bb11443 - fixing possible oob dereference when parsing mbox files

libclamav/mbox.c

@@ -724,7 +724,7 @@ parseEmailFile(fmap_t *map, size_t *at, const table_t *rfc821, const char *first
 				 * Handle broken headers, where the next
 				 * line isn't indented by whitespace
 				 */
-				if(fullline[fulllinelength - 2] == ';')
+				if(fullline[strlen(fullline) - 1] == ';')
 					/* Add arguments to this line */
 					continue;