* [PATCH] regmap: debugfs: fix a memory leak when calling regmap_attach_dev
@ 2020-12-25 12:26 Xiaolei Wang
[not found] ` <737e8b89-5748-2ef5-5294-8e65421931b9@web.de>
0 siblings, 1 reply; 5+ messages in thread
From: Xiaolei Wang @ 2020-12-25 12:26 UTC (permalink / raw)
To: broonie; +Cc: gregkh, rafael, linux-kernel
This should be caused by
commit <9b947a13e7f6> ("<regmap: use debugfs even when no device>")
After initializing the regmap through
syscon_regmap_lookup_by_compatible, then regmap_attach_dev to the
device, because the debugfs_name has been allocated, there is no need to
redistribute it again
unreferenced object 0xd8399b80 (size 64):
comm "swapper/0", pid 1, jiffies 4294937641 (age 278.590s)
hex dump (first 32 bytes):
64 75 6d 6d 79 2d 69 6f 6d 75 78 63 2d 67 70 72
dummy-iomuxc-gpr
40 32 30 65 34 30 30 30 00 7f 52 5b d8 7e 42 69
@20e4000..R[.~Bi
backtrace:
[<ca384d6f>] kasprintf+0x2c/0x54
[<6ad3bbc2>] regmap_debugfs_init+0xdc/0x2fc
[<bc4181da>] __regmap_init+0xc38/0xd88
[<1f7e0609>] of_syscon_register+0x168/0x294
[<735e8766>] device_node_get_regmap+0x6c/0x98
[<d96c8982>] imx6ul_init_machine+0x20/0x88
[<0456565b>] customize_machine+0x1c/0x30
[<d07393d8>] do_one_initcall+0x80/0x3ac
[<7e584867>] kernel_init_freeable+0x170/0x1f0
[<80074741>] kernel_init+0x8/0x120
[<285d6f28>] ret_from_fork+0x14/0x20
[<00000000>] 0x0
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
---
drivers/base/regmap/regmap-debugfs.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 8dfac7f3ed7a..271142981f98 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -582,8 +582,10 @@ void regmap_debugfs_init(struct regmap *map)
devname = dev_name(map->dev);
if (name) {
- map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
+ if (!map->debugfs_name) {
+ map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
devname, name);
+ }
name = map->debugfs_name;
} else {
name = devname;
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* RE: [PATCH] regmap: debugfs: fix a memory leak when calling regmap_attach_dev
[not found] ` <737e8b89-5748-2ef5-5294-8e65421931b9@web.de>
@ 2020-12-27 12:18 ` Wang, Xiaolei
0 siblings, 0 replies; 5+ messages in thread
From: Wang, Xiaolei @ 2020-12-27 12:18 UTC (permalink / raw)
To: Markus Elfring, kernel-janitors
Cc: linux-kernel, Greg Kroah-Hartman, Mark Brown, Rafael J. Wysocki
Hi Markus
> This should be caused by
> commit <9b947a13e7f6> ("<regmap: use debugfs even when no device>")
> I suggest to omit angle brackets from such information.
> * Will another imperative wording become helpful for the commit description?
> * How do you think about to add the tag “Fixes”?
Do you mean so?
commit:
9b947a13e7f6 ("regmap: use debugfs even when no device")
…
> +++ b/drivers/base/regmap/regmap-debugfs.c
…
> @@ -582,8 +582,10 @@ void regmap_debugfs_init(struct regmap *map)
> devname = dev_name(map->dev);
>
> if (name) {
> - map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
> + if (!map->debugfs_name) {
> + map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
> devname, name);
> + }
…
> I propose to add another null pointer check together with corresponding exception handling.
Which one do you mean by "another null point"? Do you mean that if the call "regmap_debugfs_init" function is repeated, it returns directly?
Regards,
Xiaolei
-----Original Message-----
From: Markus Elfring <Markus.Elfring@web.de>
Sent: Saturday, December 26, 2020 10:16 PM
To: Wang, Xiaolei <Xiaolei.Wang@windriver.com>; kernel-janitors@vger.kernel.org
Cc: linux-kernel@vger.kernel.org; Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Mark Brown <broonie@kernel.org>; Rafael J. Wysocki <rafael@kernel.org>
Subject: Re: [PATCH] regmap: debugfs: fix a memory leak when calling regmap_attach_dev
> This should be caused by
> commit <9b947a13e7f6> ("<regmap: use debugfs even when no device>")
I suggest to omit angle brackets from such information.
* Will another imperative wording become helpful for the commit description?
* How do you think about to add the tag “Fixes”?
…
> +++ b/drivers/base/regmap/regmap-debugfs.c
…
> @@ -582,8 +582,10 @@ void regmap_debugfs_init(struct regmap *map)
> devname = dev_name(map->dev);
>
> if (name) {
> - map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
> + if (!map->debugfs_name) {
> + map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
> devname, name);
> + }
…
I propose to add another null pointer check together with corresponding exception handling.
Regards,
Markus
^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: [PATCH] regmap: debugfs: fix a memory leak when calling regmap_attach_dev
@ 2020-12-27 12:18 ` Wang, Xiaolei
0 siblings, 0 replies; 5+ messages in thread
From: Wang, Xiaolei @ 2020-12-27 12:18 UTC (permalink / raw)
To: Markus Elfring, kernel-janitors
Cc: linux-kernel, Greg Kroah-Hartman, Mark Brown, Rafael J. Wysocki
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^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: regmap: debugfs: fix a memory leak when calling regmap_attach_dev
[not found] ` <46e289a6-49ab-a627-dab1-56a8b0587c08@web.de>
@ 2020-12-28 2:26 ` Wang, Xiaolei
0 siblings, 0 replies; 5+ messages in thread
From: Wang, Xiaolei @ 2020-12-28 2:26 UTC (permalink / raw)
To: Markus Elfring, kernel-janitors
Cc: linux-kernel, Greg Kroah-Hartman, Mark Brown, Rafael J. Wysocki
> Do you mean so?
>
> commit:
> 9b947a13e7f6 ("regmap: use debugfs even when no device")
> Please take another look at known information sources.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=f838f8d2b694cf9d524dc4423e9dd2db13892f3f#n89
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=f838f8d2b694cf9d524dc4423e9dd2db13892f3f#n121
> Which one do you mean by "another null point"?
How do you think about to check if calls of the function “kasprintf” succeeded here?
https://elixir.bootlin.com/linux/v5.10.3/source/lib/kasprintf.c#L53
Will any more exception handling become relevant also for the implementation of the function “regmap_debugfs_init”?
-----Original Message-----
From: Markus Elfring <Markus.Elfring@web.de>
Sent: Sunday, December 27, 2020 9:40 PM
To: Wang, Xiaolei <Xiaolei.Wang@windriver.com>; kernel-janitors@vger.kernel.org
Cc: linux-kernel@vger.kernel.org; Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Mark Brown <broonie@kernel.org>; Rafael J. Wysocki <rafael@kernel.org>
Subject: Re: regmap: debugfs: fix a memory leak when calling regmap_attach_dev
> Do you mean so?
>
> commit:
> 9b947a13e7f6 ("regmap: use debugfs even when no device")
> Please take another look at known information sources.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=f838f8d2b694cf9d524dc4423e9dd2db13892f3f#n89
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=f838f8d2b694cf9d524dc4423e9dd2db13892f3f#n121
> Which one do you mean by "another null point"?
> How do you think about to check if calls of the function “kasprintf” succeeded here?
> https://elixir.bootlin.com/linux/v5.10.3/source/lib/kasprintf.c#L53
> Will any more exception handling become relevant also for the implementation of the function “regmap_debugfs_init”?
Thanks for your suggestion, I will modify the commit log and add another null point check together with corresponding exception handling
Regards,
Xiaolei
^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: regmap: debugfs: fix a memory leak when calling regmap_attach_dev
@ 2020-12-28 2:26 ` Wang, Xiaolei
0 siblings, 0 replies; 5+ messages in thread
From: Wang, Xiaolei @ 2020-12-28 2:26 UTC (permalink / raw)
To: Markus Elfring, kernel-janitors
Cc: linux-kernel, Greg Kroah-Hartman, Mark Brown, Rafael J. Wysocki
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bGVpIA0K
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-12-28 2:27 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-25 12:26 [PATCH] regmap: debugfs: fix a memory leak when calling regmap_attach_dev Xiaolei Wang
[not found] ` <737e8b89-5748-2ef5-5294-8e65421931b9@web.de>
2020-12-27 12:18 ` Wang, Xiaolei
2020-12-27 12:18 ` Wang, Xiaolei
[not found] ` <46e289a6-49ab-a627-dab1-56a8b0587c08@web.de>
2020-12-28 2:26 ` Wang, Xiaolei
2020-12-28 2:26 ` Wang, Xiaolei
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