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

From: Junhao He
Date: Thu Aug 17 2023 - 05:03:26 EST


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