From: Qian Cai <cai@xxxxxx>
Subject: drivers/base/platform.c: kmemleak ignore a known leak
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@xxxxxx
Signed-off-by: Qian Cai <cai@xxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Rafael J . Wysocki" <rafael.j.wysocki@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/base/platform.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/base/platform.c~drivers-base-kmemleak-ignore-a-known-leak
+++ a/drivers/base/platform.c
@@ -26,6 +26,7 @@
#include <linux/clk/clk-conf.h>
#include <linux/limits.h>
#include <linux/property.h>
+#include <linux/kmemleak.h>
#include "base.h"
#include "power/power.h"
@@ -524,6 +525,8 @@ struct platform_device *platform_device_
if (!pdev->dev.dma_mask)
goto err;
+ kmemleak_ignore(pdev->dev.dma_mask);
+
*pdev->dev.dma_mask = pdevinfo->dma_mask;
pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
}
_
