[lkml]   [2019]   [Dec]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 4.19 211/321] drivers/base/platform.c: kmemleak ignore a known leak
From: Qian Cai <>

[ Upstream commit 967d3010df8b6f6f9aa95c198edc5fe3646ebf36 ]

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
[<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
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.

Signed-off-by: Qian Cai <>
Reviewed-by: Andrew Morton <>
Cc: Greg Kroah-Hartman <>
Cc: "Rafael J . Wysocki" <>
Cc: Catalin Marinas <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Sasha Levin <>
drivers/base/platform.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index dff82a3c2caa9..e9be1f56929af 100644
--- a/drivers/base/platform.c
+++ b/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"
@@ -525,6 +526,8 @@ struct platform_device *platform_device_register_full(
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;

 \ /
  Last update: 2019-12-04 00:02    [W:0.930 / U:4.980 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site