CVE request - kernel: ima: fix null pointer dereference

[Eugene Teo <eugene () redhat com>]

Was cc'ed this in a couple of kernel mailing lists.

This was introduced in 6c21a7fb4 (v2.6.33-rc1).

It was first reported here http://lkml.org/lkml/2009/12/29/13, and 
subsequently here http://lkml.org/lkml/2010/2/5/76 (backtraces).

This can be reproduced by running ltp test pipe07.

http://groups.google.com/group/linux.kernel/msg/95986c94ea55c81a.
https://bugzilla.redhat.com/show_bug.cgi?id=562597

Mainline fix: https://bugzilla.redhat.com/show_bug.cgi?id=562597#c3

Thanks, Eugene
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Eugene Teo / Red Hat Security Response Team