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Alistair Popple eb1f065f90 kernel/resource: fix return code check in __request_free_mem_region 
Splitting an earlier version of a patch that allowed calling
__request_region() while holding the resource lock into a series of
patches required changing the return code for the newly introduced
__request_region_locked().

Unfortunately this change was not carried through to a subsequent commit
56fd94919b ("kernel/resource: fix locking in request_free_mem_region")
in the series.  This resulted in a use-after-free due to freeing the
struct resource without properly releasing it.  Fix this by correcting the
return code check so that the struct is not freed if the request to add it
was successful.

Link: https://lkml.kernel.org/r/20210512073528.22334-1-apopple@nvidia.com
Fixes: 56fd94919b ("kernel/resource: fix locking in request_free_mem_region")
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Muchun Song <smuchun@gmail.com>
Cc: Oliver Sang <oliver.sang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-05-14 19:41:32 -07:00
arch arm64 fixes and cpucaps.h automatic generation: 2021-05-14 10:52:47 -07:00
block
certs
crypto
Documentation A set of straightforward documentation fixes. 2021-05-12 15:38:38 -07:00
drivers drm fixes for 5.13-rc1 2021-05-14 10:38:16 -07:00
fs mm/hugetlb: fix F_SEAL_FUTURE_WRITE 2021-05-14 19:41:32 -07:00
include mm/hugetlb: fix F_SEAL_FUTURE_WRITE 2021-05-14 19:41:32 -07:00
init
ipc
kernel kernel/resource: fix return code check in __request_free_mem_region 2021-05-14 19:41:32 -07:00
lib
LICENSES
mm mm, slub: move slub_debug static key enabling outside slab_mutex 2021-05-14 19:41:32 -07:00
net
samples
scripts
security trusted-keys: match tpm_get_ops on all return paths 2021-05-12 22:36:37 +03:00
sound
tools arm64 fixes and cpucaps.h automatic generation: 2021-05-14 10:52:47 -07:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap Merge drm/drm-fixes into drm-misc-fixes 2021-05-11 13:35:52 +02:00
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS A BO list maintainance fix for TTM, removing an unused function and a 2021-05-14 09:19:38 +10:00
Makefile
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.