lkml.org 
[lkml]   [2018]   [May]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC] acpi: Declare memory allocations in acpi_ut_create_internal_object_dbg as non-leaks
Date
In kernel 4.17.0-rcX, kmemleak reports 9 leaks with tracebacks similat to
the following:

unreferenced object 0xffff880224a077e0 (size 72):
comm "swapper/0", pid 1, jiffies 4294892358 (age 1022.636s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 0e 01 01 00 00 00 00 01 ................
00 00 00 80 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<000000004f506615>] acpi_ut_create_internal_object_dbg+0x4d/0x10e
[<000000006e7730e3>] acpi_ds_build_internal_object+0xed/0x1cd
[<00000000272b7c73>] acpi_ds_build_internal_package_obj+0x245/0x3a2
[<000000000b64c50e>] acpi_ds_eval_data_object_operands+0x17b/0x21b
[<00000000589647ac>] acpi_ds_exec_end_op+0x433/0x6c1
[<000000001d69bcbf>] acpi_ps_parse_loop+0x926/0x9be
[<000000005d6fa97d>] acpi_ps_parse_aml+0x1a2/0x4af
[<00000000c4bef823>] acpi_ps_execute_table+0xbb/0x119
[<00000000fd9632e4>] acpi_ns_execute_table+0x20c/0x260
[<00000000e6ae17ac>] acpi_ns_parse_table+0x7d/0x1b3
[<0000000008e1e148>] acpi_ns_load_table+0x8d/0x1c0
[<000000009fc8346f>] acpi_tb_load_namespace+0x176/0x278
[<0000000073f98b3b>] acpi_load_tables+0x6e/0xfd
[<00000000d2ef13d2>] acpi_init+0x8c/0x340
[<000000007da19d8d>] do_one_initcall+0x46/0x1fa
[<0000000024681a1d>] kernel_init_freeable+0x1a2/0x237

According to gdb, the offending code is
object =
acpi_ut_allocate_object_desc_dbg(module_name, line_number,
component_id);

As it is not possible to unload the acpi code to test that this is a real
leak and not a false positive, and that only these 9 appear no matter how
long the system is up, a kmemleak_not_leak(object) call is inserted.

Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>
Cc: linux-acpi@vger.kernel.org
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
---
drivers/acpi/acpica/utobject.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/acpi/acpica/utobject.c b/drivers/acpi/acpica/utobject.c
index 5b78fe08d7d7..ae6d8cc18cec 100644
--- a/drivers/acpi/acpica/utobject.c
+++ b/drivers/acpi/acpica/utobject.c
@@ -8,6 +8,7 @@
*****************************************************************************/

#include <acpi/acpi.h>
+#include <linux/kmemleak.h>
#include "accommon.h"
#include "acnamesp.h"

@@ -70,6 +71,7 @@ union acpi_operand_object *acpi_ut_create_internal_object_dbg(const char
if (!object) {
return_PTR(NULL);
}
+ kmemleak_not_leak(object);

switch (type) {
case ACPI_TYPE_REGION:
--
2.16.3
\
 
 \ /
  Last update: 2018-05-12 17:00    [W:0.033 / U:3.320 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site