• Qian Cai's avatar
    drivers/base/platform.c: kmemleak ignore a known leak · 967d3010
    Qian Cai authored
    unreferenced object 0xffff808ec6dc5a80 (size 128):
      comm "swapper/0", pid 1, jiffies 4294938063 (age 2560.530s)
      hex dump (first 32 bytes):
        ff ff ff ff 00 00 00 00 6b 6b 6b 6b 6b 6b 6b 6b  ........kkkkkkkk
        6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
      backtrace:
        [<00000000476dcf8c>] kmem_cache_alloc_trace+0x430/0x500
        [<000000004f708d37>] platform_device_register_full+0xbc/0x1e8
        [<000000006c2a7ec7>] acpi_create_platform_device+0x370/0x450
        [<00000000ef135642>] acpi_default_enumeration+0x34/0x78
        [<000000003bd9a052>] acpi_bus_attach+0x2dc/0x3e0
        [<000000003cf4f7f2>] acpi_bus_attach+0x108/0x3e0
        [<000000003cf4f7f2>] acpi_bus_attach+0x108/0x3e0
        [<000000002968643e>] acpi_bus_scan+0xb0/0x110
        [<0000000010dd0bd7>] acpi_scan_init+0x1a8/0x410
        [<00000000965b3c5a>] acpi_init+0x408/0x49c
        [<00000000ed4b9fe2>] do_one_initcall+0x178/0x7f4
        [<00000000a5ac5a74>] kernel_init_freeable+0x9d4/0xa9c
        [<0000000070ea6c15>] kernel_init+0x18/0x138
        [<00000000fb8fff06>] ret_from_fork+0x10/0x1c
        [<0000000041273a0d>] 0xffffffffffffffff
    
    Then, faddr2line pointed out this line,
    
    /*
     * This memory isn't freed when the device is put,
     * I don't have a nice idea for that though.  Conceptually
     * dma_mask in struct device should not be a pointer.
     * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
     */
    pdev->dev.dma_mask =
    	kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
    
    Since this leak has existed for more than 8 years and it does not
    reference other parts of the memory, let kmemleak ignore it, so users
    don't need to waste time reporting this in the future.
    
    Link: http://lkml.kernel.org/r/20181206160751.36211-1-cai@gmx.usSigned-off-by: default avatarQian Cai <cai@gmx.us>
    Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    967d3010