linux-kernel - [PATCH 0/2] Fix memory leak in coresight drivers

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Date:   Thu, 17 Aug 2023 16:59:35 +0800
From:   Junhao He <hejunhao3@...wei.com>
To:     <suzuki.poulose@....com>, <mike.leach@...aro.org>,
        <leo.yan@...aro.org>, <james.clark@....com>
CC:     <coresight@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <jonathan.cameron@...wei.com>, <yangyicong@...wei.com>,
        <prime.zeng@...ilicon.com>, <hejunhao3@...wei.com>
Subject: [PATCH 0/2] Fix memory leak in coresight drivers

When build kernel with CONFIG_KASAN=y
there are reports of memory leaks, like:
...
unreferenced object 0xffff2020510fe200 (size 64):
  comm "insmod", pid 4642, jiffies 4295983961 (age 46049.752s)
  hex dump (first 32 bytes):
    10 20 40 06 28 20 ff ff 10 40 7f 06 20 20 ff ff  . @.( ...@..  ..
    10 20 bb 8a 20 00 ff ff 10 e0 c7 8a 20 00 ff ff  . .. ....... ...
  backtrace:
    [<0000000034ec4724>] __kmem_cache_alloc_node+0x2f8/0x348
    [<0000000057fbc15d>] __kmalloc_node_track_caller+0x5c/0x110
    [<0000000055d5e34b>] krealloc+0x8c/0x178
    [<00000000a4635beb>] coresight_alloc_device_name+0x128/0x188 [coresight]
    [<000000000ce9d17b>] smb_probe+0x268/0x478 [ultrasoc_smb]
...
unreferenced object 0xffff00213c141000 (size 1024):
  comm "systemd-udevd", pid 2123, jiffies 4294909467 (age 6062.160s)
  hex dump (first 32 bytes):
    04 00 00 00 02 00 00 00 18 10 14 3c 21 00 ff ff  ...........<!...
    00 00 00 00 00 00 00 00 03 00 00 00 10 00 00 00  ................
  backtrace:
    [<000000004b7c9001>] __kmem_cache_alloc_node+0x2f8/0x348
    [<00000000b0fc7ceb>] __kmalloc+0x58/0x108
    [<0000000064ff4695>] acpi_os_allocate+0x2c/0x68
    [<000000007d57d116>] acpi_ut_initialize_buffer+0x54/0xe0
    [<0000000024583908>] acpi_evaluate_object+0x388/0x438
    [<0000000017b2e72b>] acpi_evaluate_object_typed+0xe8/0x240
    [<000000005df0eac2>] coresight_get_platform_data+0x1b4/0x988 [coresight]
...

The patchset based on "coresight: platform: acpi: Ignore the absence of graph"
https://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux.git/commit/?h=next&id=3a2888aa1f962c55ca36119aebe67355c7bf54e4

Junhao He (2):
  coresight: Fix memory leak in acpi_buffer->pointer
  coresight: core: fix memory leak in dict->fwnode_list

 drivers/hwtracing/coresight/coresight-core.c  | 20 +++++++++-
 .../hwtracing/coresight/coresight-platform.c  | 40 ++++++++++++-------
 2 files changed, 45 insertions(+), 15 deletions(-)

-- 
2.33.0