bugGnash - The GNU Flash player - Bugs: bug #43867, int overflow

 
 

bug #43867: int overflow

Submitted by:  Joshua Rogers <megamansec3>
Submitted on:  Mon 22 Dec 2014 11:46:38 AM UTC  
 
Category:  core Severity:  3 - Normal
Release:  None Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open

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Mon 22 Dec 2014 10:41:18 PM UTC, comment #1:

It seems that if such an overflow occurs, and some bogus value is passed to construct_object, eventually Gnash will die with an exception because of too many calls to SafeStack::pop(). As far as I can tell there is no validation of nargs even if its value isn't the result of an overflow.

Bastiaan Jacques <bjacques>
Project Member
Mon 22 Dec 2014 11:46:38 AM UTC, original submission:

Hi,

In ASHandlers.cpp:

2306 unsigned nargs = toNumber(env.pop(), getVM(env));

may cause an int overflow dur to the conversation from 64bits to 32bits

And then it is used:

2325 as_object* newobj = construct_object(constructor, env, nargs);

which will cause problems.

Thanks,

Joshua Rogers <megamansec3>

 

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    Date Changed by Updated Field Previous Value => Replaced by
    2014-12-22 bjacques CategoryNone => core
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