Re: [PATCH] qed: fix memory leak of a qed_spq_entry on error failure paths

[David Miller]

From: "Mintz, Yuval" <Yuval.Mintz@xxxxxxxxxx>
Date: Sun, 18 Dec 2016 06:33:50 +0000

>> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>> 
>> A qed_spq_entry entry is allocated by qed_sp_init_request but is not kfree'd
>> if an error occurs, causing a memory leak. Fix this by kfree'ing it and also
>> setting *pp_ent to NULL to be safe.
>> 
>> Found with static analysis by CoverityScan, CIDs 1389468-1389470
>> 
>> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> ...
>> +err:
>> +	kfree(*pp_ent);
>> +	*pp_ent = NULL;
>> +
>> +	return rc;
>>  }
> 
> Hi Colin - thanks for this.
> It would have been preferable to return the previously allocated spq entry.
> I.e., do:
> 
> +err:
> +	qed_spq_return_entry(p_hwfn, *pp_ent);
> +	*pp_ent = NULL;
> +	return rc;

Looking at this last night, I came to the same conclusion.