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Message-ID: <b1fa28b5-a93a-4580-8f50-b27f975216d3@oracle.com>
Date: Tue, 28 Nov 2023 23:25:14 +0530
From: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Borislav Petkov <bp@...en8.de>, Tony Luck <tony.luck@...el.com>,
James Morse <james.morse@....com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Robert Richter <rric@...nel.org>, linux-edac@...r.kernel.org,
linux-kernel@...r.kernel.org, dan.carpenter@...aro.org,
kernel-janitors@...r.kernel.org, error27@...il.com
Subject: Re: [PATCH] EDAC/sysfs: Fix calling kobject_put() without kobj
initialization
Hi Greg,
On 28/11/23 9:58 pm, Greg Kroah-Hartman wrote:
> On Tue, Nov 28, 2023 at 05:09:52AM -0800, Harshit Mogalapalli wrote:
>> In edac_pci_main_kobj_setup() when dev_root is NULL,
>> kobject_init_and_add() is not called.
>>
>> if (err) { // err = -ENODEV;
>> edac_dbg(1, "Failed to register '.../edac/pci'\n");
>> goto kobject_init_and_add_fail; // call to kobject_put()
>> }
>>
>> This will cause a runtime warning in kobject_put() if the above happens.
>> Warning:
>> "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called."
>>
>> Fix the error handling to avoid the above possible situation.
>>
>> Fixes: cb4a0bec0bb9 ("EDAC/sysfs: move to use bus_get_dev_root()")
>> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
>> ---
>> This is based on static analysis with Smatch and only compile tested.
>> ---
>> drivers/edac/edac_pci_sysfs.c | 14 ++++++++------
>> 1 file changed, 8 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/edac/edac_pci_sysfs.c b/drivers/edac/edac_pci_sysfs.c
>> index 901d4cd3ca38..71a0d4b9c2cf 100644
>> --- a/drivers/edac/edac_pci_sysfs.c
>> +++ b/drivers/edac/edac_pci_sysfs.c
>> @@ -370,12 +370,14 @@ static int edac_pci_main_kobj_setup(void)
>>
>> /* Instanstiate the pci object */
>> dev_root = bus_get_dev_root(edac_subsys);
>> - if (dev_root) {
>> - err = kobject_init_and_add(edac_pci_top_main_kobj,
>> - &ktype_edac_pci_main_kobj,
>> - &dev_root->kobj, "pci");
>> - put_device(dev_root);
>> - }
>> + if (!dev_root)
>> + goto kzalloc_fail;
>> +
>> + err = kobject_init_and_add(edac_pci_top_main_kobj,
>> + &ktype_edac_pci_main_kobj,
>> + &dev_root->kobj, "pci");
>> + put_device(dev_root);
>> +
>> if (err) {
>> edac_dbg(1, "Failed to register '.../edac/pci'\n");
>> goto kobject_init_and_add_fail;
>> --
>> 2.39.3
>>
>
> Hi,
>
> This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
> a patch that has triggered this response. He used to manually respond
> to these common problems, but in order to save his sanity (he kept
> writing the same thing over and over, yet to different people), I was
> created. Hopefully you will not take offence and will fix the problem
> in your patch and resubmit it so that it can be accepted into the Linux
> kernel tree.
>
> You are receiving this message because of the following common error(s)
> as indicated below:
>
> - This looks like a new version of a previously submitted patch, but you
> did not list below the --- line any changes from the previous version.
> Please read the section entitled "The canonical patch format" in the
> kernel file, Documentation/process/submitting-patches.rst for what
> needs to be done here to properly describe this.
>
> - You have marked a patch with a "Fixes:" tag for a commit that is in an
> older released kernel, yet you do not have a cc: stable line in the
> signed-off-by area at all, which means that the patch will not be
> applied to any older kernel releases. To properly fix this, please
> follow the documented rules in the
> Documentation/process/stable-kernel-rules.rst file for how to resolve
> this.
>
> If you wish to discuss this problem further, or you have questions about
> how to resolve this issue, please feel free to respond to this email and
> Greg will reply once he has dug out from the pending patches received
> from other developers.
No, this is a similar bug but in the edac_pci_sysfs.c file instead of
the edac_device_sysfs.c.
Let me resend these two patches as a patchset and change the subject to
make it more obvious(EDAC/pci_sysfs, EDAC/device_sysfs in title). And
add a CC stable tag.
Thanks,
Harshit
>
> thanks,
>
> greg k-h's patch email bot
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