[PATCH v2 0/2] ACPI, APEI: Memory leaks

[Joshua Hunt]

While investigating a possible memory leak using kmemleak I came across the
following five leaks coming from APEI and ERST:

unreferenced object 0xffff880402b6ee80 (size 32):
  comm "swapper/0", pid 1, jiffies 4294669373 (age 318.183s)
  hex dump (first 32 bytes):
    58 fe ab fa 03 88 ff ff 58 fe ab fa 03 88 ff ff  X.......X.......
    18 50 ea dc 00 00 00 00 3f 50 ea dc 00 00 00 00  .P......?P......
  backtrace:
    [<ffffffff82195c33>] create_object+0x103/0x2c0
    [<ffffffff826868b2>] kmemleak_alloc+0x82/0xc0
    [<ffffffff8218248b>] kmem_cache_alloc_trace+0x17b/0x210
    [<ffffffff8241a6fa>] apei_res_add+0x19a/0x200
    [<ffffffff8241a7e2>] collect_res_callback+0x82/0xa0
    [<ffffffff8241a225>] apei_exec_for_each_entry+0x85/0xb0
    [<ffffffff8241a26a>] apei_exec_collect_resources+0x1a/0x20
    [<ffffffff82afe532>] erst_init+0x3d6/0x3e5
    [<ffffffff820004bd>] do_one_initcall+0x19d/0x1d0
    [<ffffffff82ac1152>] kernel_init_freeable+0x13d/0x1d6
    [<ffffffff82684a8e>] kernel_init+0xe/0xf0
    [<ffffffff826909d2>] ret_from_fork+0x42/0x70
    [<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff880402b6ee40 (size 32):
  comm "swapper/0", pid 1, jiffies 4294670231 (age 317.326s)
  hex dump (first 32 bytes):
    68 fe ab fa 03 88 ff ff 68 fe ab fa 03 88 ff ff  h.......h.......
    b2 00 00 00 00 00 00 00 b3 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff82195c33>] create_object+0x103/0x2c0
    [<ffffffff826868b2>] kmemleak_alloc+0x82/0xc0
    [<ffffffff8218248b>] kmem_cache_alloc_trace+0x17b/0x210
    [<ffffffff8241a6fa>] apei_res_add+0x19a/0x200
    [<ffffffff8241a7fc>] collect_res_callback+0x9c/0xa0
    [<ffffffff8241a225>] apei_exec_for_each_entry+0x85/0xb0
    [<ffffffff8241a26a>] apei_exec_collect_resources+0x1a/0x20
    [<ffffffff82afe532>] erst_init+0x3d6/0x3e5
    [<ffffffff820004bd>] do_one_initcall+0x19d/0x1d0
    [<ffffffff82ac1152>] kernel_init_freeable+0x13d/0x1d6
    [<ffffffff82684a8e>] kernel_init+0xe/0xf0
    [<ffffffff826909d2>] ret_from_fork+0x42/0x70
    [<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff880402b6ee20 (size 32):
  comm "swapper/0", pid 1, jiffies 4294672240 (age 315.317s)
  hex dump (first 32 bytes):
    88 fd ab fa 03 88 ff ff 00 ee b6 02 04 88 ff ff  ................
    00 d0 15 cd 00 00 00 00 00 40 16 cd 00 00 00 00  .........@......
  backtrace:
    [<ffffffff82195c33>] create_object+0x103/0x2c0
    [<ffffffff826868b2>] kmemleak_alloc+0x82/0xc0
    [<ffffffff8218248b>] kmem_cache_alloc_trace+0x17b/0x210
    [<ffffffff8241a6fa>] apei_res_add+0x19a/0x200
    [<ffffffff8241a81a>] apei_get_res_callback+0x1a/0x20
    [<ffffffff823d0f8b>] acpi_nvs_for_each_region+0x2b/0x50
    [<ffffffff8241ae95>] apei_resources_request+0x95/0x380
    [<ffffffff82afe23e>] erst_init+0xe2/0x3e5
    [<ffffffff820004bd>] do_one_initcall+0x19d/0x1d0
    [<ffffffff82ac1152>] kernel_init_freeable+0x13d/0x1d6
    [<ffffffff82684a8e>] kernel_init+0xe/0xf0
    [<ffffffff826909d2>] ret_from_fork+0x42/0x70
    [<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff880402b6ee00 (size 32):
  comm "swapper/0", pid 1, jiffies 4294672400 (age 315.157s)
  hex dump (first 32 bytes):
    20 ee b6 02 04 88 ff ff 88 fd ab fa 03 88 ff ff   ...............
    00 80 f3 dc 00 00 00 00 00 60 a9 dd 00 00 00 00  .........`......
  backtrace:
    [<ffffffff82195c33>] create_object+0x103/0x2c0
    [<ffffffff826868b2>] kmemleak_alloc+0x82/0xc0
    [<ffffffff8218248b>] kmem_cache_alloc_trace+0x17b/0x210
    [<ffffffff8241a6fa>] apei_res_add+0x19a/0x200
    [<ffffffff8241a81a>] apei_get_res_callback+0x1a/0x20
    [<ffffffff823d0f8b>] acpi_nvs_for_each_region+0x2b/0x50
    [<ffffffff8241ae95>] apei_resources_request+0x95/0x380
    [<ffffffff82afe23e>] erst_init+0xe2/0x3e5
    [<ffffffff820004bd>] do_one_initcall+0x19d/0x1d0
    [<ffffffff82ac1152>] kernel_init_freeable+0x13d/0x1d6
    [<ffffffff82684a8e>] kernel_init+0xe/0xf0
    [<ffffffff826909d2>] ret_from_fork+0x42/0x70
    [<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff880402b6ede0 (size 32):
  comm "swapper/0", pid 1, jiffies 4294672863 (age 314.698s)
  hex dump (first 32 bytes):
    a8 fd ab fa 03 88 ff ff a8 fd ab fa 03 88 ff ff  ................
    00 00 00 f8 00 00 00 00 00 00 00 fc 00 00 00 00  ................
  backtrace:
    [<ffffffff82195c33>] create_object+0x103/0x2c0
    [<ffffffff826868b2>] kmemleak_alloc+0x82/0xc0
    [<ffffffff8218248b>] kmem_cache_alloc_trace+0x17b/0x210
    [<ffffffff8241a6fa>] apei_res_add+0x19a/0x200
    [<ffffffff8241a81a>] apei_get_res_callback+0x1a/0x20
    [<ffffffff82582d61>] pci_mmcfg_for_each_region+0x51/0x60
    [<ffffffff8241b14a>] apei_resources_request+0x34a/0x380
    [<ffffffff82afe23e>] erst_init+0xe2/0x3e5
    [<ffffffff820004bd>] do_one_initcall+0x19d/0x1d0
    [<ffffffff82ac1152>] kernel_init_freeable+0x13d/0x1d6
    [<ffffffff82684a8e>] kernel_init+0xe/0xf0
    [<ffffffff826909d2>] ret_from_fork+0x42/0x70
    [<ffffffffffffffff>] 0xffffffffffffffff

The issue has been reported a handful of times upstream. Here is one of the previous
reports: https://lkml.org/lkml/2013/8/11/149

This series resolves the reported leaks and kmemleak is clean with these patches applied.

Changes from v1 as per Gong Chen's comments:
	* Use existing apei_resources_fini calls to do the cleanup
	* Update changelog in erst_init patch

Joshua Hunt (2):
  ACPI, APEI: Fix leaked resources
  ACPI, APEI, ERST: Fixed leaked resources in erst_init

 drivers/acpi/apei/apei-base.c |    6 ++++--
 drivers/acpi/apei/erst.c      |    3 +++
 2 files changed, 7 insertions(+), 2 deletions(-)

-- 
1.7.9.5