linux-kernel - Re: [PATCH] thermal/lib: Fix memory leak on error in thermal_genl

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Message-ID: <9ba3fa17-57c3-41e9-9e19-33fa105a179e@linaro.org>
Date: Thu, 24 Oct 2024 14:57:09 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Markus Elfring <Markus.Elfring@....de>, linux-pm@...r.kernel.org,
 Lukasz Luba <lukasz.luba@....com>, "Rafael J. Wysocki" <rafael@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH] thermal/lib: Fix memory leak on error in
 thermal_genl_auto()

On 24/10/2024 14:02, Markus Elfring wrote:
>> The function thermal_genl_auto() does not free the allocated message
>> in the error path. Fix that by putting a out label and jump to it
>> which will free the message instead of directly returning an error.
> 
> Would you like to add any tags (like “Fixes” and “Cc”) accordingly?
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.12-rc4#n145
> 
> 
> …
>> +++ b/tools/lib/thermal/commands.c
>> @@ -375,27 +375,30 @@ static thermal_error_t thermal_genl_auto(struct thermal_handler *th, cmd_cb_t cm
>>   					 struct cmd_param *param,
>>   					 int cmd, int flags, void *arg)
>>   {
>> +	thermal_error_t ret = THERMAL_ERROR;
>>   	struct nl_msg *msg;
>>   	void *hdr;
>>
>>   	msg = nlmsg_alloc();
>>   	if (!msg)
>> -		return THERMAL_ERROR;
>> +		goto out;
> …
> 
> Is it really reasonable to pass a null pointer (from a failed function call)
> to a subsequent nlmsg_free() call?

You are right, I should return here :S



> Can it be more appropriate to return directly in such an error case?
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst?h=v6.12-rc4#n532
> 
> Regards,
> Markus


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