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Re: [Full-Disclosure] Re: Linux Kernel sctp_setsockopt() Integer Overflow

From: Stefan Esser (s.essere-matters.de)
Date: Sat May 15 2004 - 17:08:50 CDT

> How did you come from the above snippet of the code to the idea that
> kmalloc(0) returns NULL?

Doesn't matter: the first thing linux's sys_setsockopt() does is
checking if optlen is < 0. It will fail in this case. So the
needed optlen is never handled down to the protocol setsockopt function.
Otherwise you would find several protocol handlers vulnerable...
f.e. IPv6...

Stefan Esser

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