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linux/drivers/fpga
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Jinjie Ruan 28926daf73 fpga: Fix memory leak for fpga_region_test_class_find() 
fpga_region_class_find() in fpga_region_test_class_find() will call
get_device() if the data is matched, which will increment refcount for
dev->kobj, so it should call put_device() to decrement refcount for
dev->kobj to free the region, because fpga_region_unregister() will call
fpga_region_dev_release() only when the refcount for dev->kobj is zero
but fpga_region_test_init() call device_register() in
fpga_region_register_full(), which also increment refcount.

So call put_device() after calling fpga_region_class_find() in
fpga_region_test_class_find(). After applying this patch, the following
memory leak is never detected.

unreferenced object 0xffff88810c8ef000 (size 1024):
  comm "kunit_try_catch", pid 1875, jiffies 4294715298 (age 836.836s)
  hex dump (first 32 bytes):
    b8 d1 fb 05 81 88 ff ff 08 f0 8e 0c 81 88 ff ff  ................
    08 f0 8e 0c 81 88 ff ff 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff817ebad7>] kmalloc_trace+0x27/0xa0
    [<ffffffffa02385e1>] fpga_region_register_full+0x51/0x430 [fpga_region]
    [<ffffffffa0228e47>] 0xffffffffa0228e47
    [<ffffffff829c479d>] kunit_try_run_case+0xdd/0x250
    [<ffffffff829c9f2a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
    [<ffffffff81238b85>] kthread+0x2b5/0x380
    [<ffffffff81097ded>] ret_from_fork+0x2d/0x70
    [<ffffffff810034d1>] ret_from_fork_asm+0x11/0x20
unreferenced object 0xffff888105fbd1b8 (size 8):
  comm "kunit_try_catch", pid 1875, jiffies 4294715298 (age 836.836s)
  hex dump (first 8 bytes):
    72 65 67 69 6f 6e 30 00                          region0.
  backtrace:
    [<ffffffff817ec023>] __kmalloc_node_track_caller+0x53/0x150
    [<ffffffff82995590>] kvasprintf+0xb0/0x130
    [<ffffffff83f713b1>] kobject_set_name_vargs+0x41/0x110
    [<ffffffff8304ac1b>] dev_set_name+0xab/0xe0
    [<ffffffffa02388a2>] fpga_region_register_full+0x312/0x430 [fpga_region]
    [<ffffffffa0228e47>] 0xffffffffa0228e47
    [<ffffffff829c479d>] kunit_try_run_case+0xdd/0x250
    [<ffffffff829c9f2a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
    [<ffffffff81238b85>] kthread+0x2b5/0x380
    [<ffffffff81097ded>] ret_from_fork+0x2d/0x70
    [<ffffffff810034d1>] ret_from_fork_asm+0x11/0x20
unreferenced object 0xffff88810b3b8a00 (size 256):
  comm "kunit_try_catch", pid 1875, jiffies 4294715298 (age 836.836s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 08 8a 3b 0b 81 88 ff ff  ..........;.....
    08 8a 3b 0b 81 88 ff ff e0 ac 04 83 ff ff ff ff  ..;.............
  backtrace:
    [<ffffffff817ebad7>] kmalloc_trace+0x27/0xa0
    [<ffffffff83056d7a>] device_add+0xa2a/0x15e0
    [<ffffffffa02388b1>] fpga_region_register_full+0x321/0x430 [fpga_region]
    [<ffffffffa0228e47>] 0xffffffffa0228e47
    [<ffffffff829c479d>] kunit_try_run_case+0xdd/0x250
    [<ffffffff829c9f2a>] kunit_generic_run_threadfn_adapter+0x4a/0x90
    [<ffffffff81238b85>] kthread+0x2b5/0x380
    [<ffffffff81097ded>] ret_from_fork+0x2d/0x70
    [<ffffffff810034d1>] ret_from_fork_asm+0x11/0x20

Fixes: 64a5f972c9 ("fpga: add an initial KUnit suite for the FPGA Region")
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Marco Pagani <marpagan@redhat.com>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20231007094321.3447084-1-ruanjinjie@huawei.com
[yilun.xu@intel.com: slightly changes the commit message]
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
Link: https://lore.kernel.org/r/20231023032857.902699-3-yilun.xu@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-10-24 19:32:39 +02:00
..
tests fpga: Fix memory leak for fpga_region_test_class_find() 2023-10-24 19:32:39 +02:00
altera-cvp.c fpga: mgr: Use standard dev_release for class driver 2021-11-28 13:59:13 -08:00
altera-fpga2sdram.c fpga: Explicitly include correct DT includes 2023-07-17 09:23:04 +08:00
altera-freeze-bridge.c fpga: Explicitly include correct DT includes 2023-07-17 09:23:04 +08:00
altera-hps2fpga.c fpga: bridge: Use standard dev_release for class driver 2021-11-28 14:02:13 -08:00
altera-pr-ip-core-plat.c fpga: Explicitly include correct DT includes 2023-07-17 09:23:04 +08:00
altera-pr-ip-core.c fpga: altera-pr-ip: fix unsigned comparison with less than zero 2022-06-10 15:48:23 +08:00
altera-ps-spi.c fpga: mgr: Use standard dev_release for class driver 2021-11-28 13:59:13 -08:00
dfl-afu-dma-region.c fpga: dfl: afu: convert get_user_pages() --> pin_user_pages() 2020-06-18 18:12:06 -07:00
dfl-afu-error.c fpga: dfl: afu: harden port enable logic 2021-03-24 11:15:04 -07:00
dfl-afu-main.c fpga: dfl: afu: harden port enable logic 2021-03-24 11:15:04 -07:00
dfl-afu-region.c fpga: dfl: more kernel-doc corrections 2023-01-28 23:33:43 +08:00
dfl-afu.h fpga: dfl: more kernel-doc corrections 2023-01-28 23:33:43 +08:00
dfl-fme-br.c fpga: bridge: Use standard dev_release for class driver 2021-11-28 14:02:13 -08:00
dfl-fme-error.c fpga: dfl: fme: add interrupt support for global error reporting 2020-07-06 21:35:42 -07:00
dfl-fme-main.c fpga: dfl: fme: use SI unit prefix macros 2023-07-10 14:41:53 +08:00
dfl-fme-mgr.c fpga: dfl-fme-mgr: Convert to devm_platform_ioremap_resource() 2023-07-10 16:41:44 +08:00
dfl-fme-perf.c fpga: dfl: more kernel-doc corrections 2023-01-28 23:33:43 +08:00
dfl-fme-pr.c fpga: dfl: kernel-doc corrections 2023-01-28 23:33:05 +08:00
dfl-fme-pr.h fpga: dfl: more kernel-doc corrections 2023-01-28 23:33:43 +08:00
dfl-fme-region.c fpga: region: Use standard dev_release for class driver 2021-11-28 14:02:41 -08:00
dfl-fme.h fpga: dfl: fme: add performance reporting support 2020-04-28 15:49:28 +02:00
dfl-n3000-nios.c fpga: fix spelling mistakes 2021-07-21 19:54:21 -07:00
dfl-pci.c fpga: dfl-pci: Use pci_find_vsec_capability() to simplify the code 2023-08-07 18:21:40 +08:00
dfl.c Driver core changes for 6.3-rc1 2023-02-24 12:58:55 -08:00
dfl.h Char/Misc and other driver subsystem changes for 6.3-rc1 2023-02-24 12:47:33 -08:00
fpga-bridge.c fpga: bridge: make fpga_bridge_class a static const structure 2023-08-11 23:03:37 +08:00
fpga-mgr.c fpga: fpga-mgr: make fpga_mgr_class a static const structure 2023-08-11 23:04:03 +08:00
fpga-region.c fpga: region: make fpga_region_class a static const structure 2023-08-11 23:04:21 +08:00
ice40-spi.c fpga: mgr: Use standard dev_release for class driver 2021-11-28 13:59:13 -08:00
intel-m10-bmc-sec-update.c mfd: intel-m10-bmc: Manage access to MAX 10 fw handshake registers 2023-06-15 09:19:36 +01:00
Kconfig fpga: add configuration for the FPGA KUnit test suites. 2023-07-23 14:04:50 +08:00
lattice-sysconfig-spi.c fpga: lattice-sysconfig-spi: Add explicit include for of.h 2023-04-06 20:36:27 +02:00
lattice-sysconfig.c fpga: lattice-sysconfig-spi: add Lattice sysCONFIG FPGA manager 2022-10-25 14:44:03 +08:00
lattice-sysconfig.h fpga: lattice-sysconfig-spi: add Lattice sysCONFIG FPGA manager 2022-10-25 14:44:03 +08:00
machxo2-spi.c fpga: mgr: Use standard dev_release for class driver 2021-11-28 13:59:13 -08:00
Makefile fpga: add configuration for the FPGA KUnit test suites. 2023-07-23 14:04:50 +08:00
microchip-spi.c fpga: Explicitly include correct DT includes 2023-07-17 09:23:04 +08:00
of-fpga-region.c fpga: Explicitly include correct DT includes 2023-07-17 09:23:04 +08:00
socfpga-a10.c fpga: socfpga-a10: Convert to devm_platform_ioremap_resource() 2023-07-15 22:46:58 +08:00
socfpga.c fpga: fpga-mgr: socfpga: Convert to devm_platform_ioremap_resource() 2023-07-10 16:48:04 +08:00
stratix10-soc.c fpga: Explicitly include correct DT includes 2023-07-17 09:23:04 +08:00
ts73xx-fpga.c fpga: fpga-mgr: ts73xx: Convert to devm_platform_ioremap_resource() 2023-07-10 16:52:58 +08:00
versal-fpga.c fpga: mgr: Use standard dev_release for class driver 2021-11-28 13:59:13 -08:00
xilinx-pr-decoupler.c fpga: xilinx-pr-decoupler: Convert to devm_platform_ioremap_resource() 2023-07-10 16:44:48 +08:00
xilinx-spi.c fpga: mgr: Use standard dev_release for class driver 2021-11-28 13:59:13 -08:00
zynq-fpga.c fpga: zynq-fpga: Convert to devm_platform_ioremap_resource() 2023-07-10 16:55:06 +08:00
zynqmp-fpga.c fpga: zynqmp-fpga: Adds status interface 2023-03-09 17:33:19 +01:00