fix NULL pointer dereference in __vm_enough_memory()
authorAlan Cox <alan@lxorguk.ukuu.org.uk>
Wed, 22 Aug 2007 21:01:28 +0000 (14:01 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Thu, 23 Aug 2007 02:52:45 +0000 (19:52 -0700)
commit34b4e4aa3c470ce8fa2bd78abb1741b4b58baad7
tree91d620288f1aaf63c12dc84ca1015465818601f2
parentafe1ab4d577892822de2c8e803fbfaed6ec44ba3
fix NULL pointer dereference in __vm_enough_memory()

The new exec code inserts an accounted vma into an mm struct which is not
current->mm.  The existing memory check code has a hard coded assumption
that this does not happen as does the security code.

As the correct mm is known we pass the mm to the security method and the
helper function.  A new security test is added for the case where we need
to pass the mm and the existing one is modified to pass current->mm to
avoid the need to change large amounts of code.

(Thanks to Tobias for fixing rejects and testing)

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: WU Fengguang <wfg@mail.ustc.edu.cn>
Cc: James Morris <jmorris@redhat.com>
Cc: Tobias Diedrich <ranma+kernel@tdiedrich.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/mm.h
include/linux/security.h
mm/mmap.c
mm/nommu.c
security/commoncap.c
security/dummy.c
security/selinux/hooks.c