shdocvw.dll navigate_url variable not checked for null

Gluck ortuna at
Fri Jul 11 23:57:36 CDT 2008

Good evening,

 I recently came across a program that would crash with an "Access violation
in shdocvw.dll at address 0x000002".  after doing some tracing the program
was sending out a navigate_url and the variable url was set to null.  The
function then does a create_callback with those variables causing the access

Changelog:  checking  LPCWSTR url for null and returning S_FALSE if it is

first time submitting a patch, so please let me know if I messed up

Sumeet Singh
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