lkml.org 
[lkml]   [2019]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] knav_qmss_queue: fix a missing-check bug in knav_pool_create()
From
Date
Hi Gen,

No idea why I'm being cc'd on this but hey... ;-)

On 11/06/2019 10:37, Gen Zhang wrote:
> On Thu, May 30, 2019 at 11:39:49AM +0800, Gen Zhang wrote:
>> In knav_pool_create(), 'pool->name' is allocated by kstrndup(). It
>> returns NULL when fails. So 'pool->name' should be checked. And free
>> 'pool' when error.
>>
>> Signed-off-by: Gen Zhang <blackgod016574@gmail.com>
>> ---
>> diff --git a/drivers/soc/ti/knav_qmss_queue.c b/drivers/soc/ti/knav_qmss_queue.c
>> index 8b41837..0f8cb28 100644
>> --- a/drivers/soc/ti/knav_qmss_queue.c
>> +++ b/drivers/soc/ti/knav_qmss_queue.c
>> @@ -814,6 +814,12 @@ void *knav_pool_create(const char *name,
>> }
>>
>> pool->name = kstrndup(name, KNAV_NAME_SIZE - 1, GFP_KERNEL);
>> + if (!pool->name) {
>> + dev_err(kdev->dev, "failed to duplicate for pool(%s)\n",
>> + name);

There is no need to output anything, the kernel will be loud enough if
you run out of memory.

>> + ret = -ENOMEM;
>> + goto err_name;
>> + }
>> pool->kdev = kdev;
>> pool->dev = kdev->dev;
>>
>> @@ -864,6 +870,7 @@ void *knav_pool_create(const char *name,
>> mutex_unlock(&knav_dev_lock);
>> err:
>> kfree(pool->name);
>> +err_name:

kfree(NULL) is perfectly valid, there is no need to create a second
label. Just branch to the existing error label.

>> devm_kfree(kdev->dev, pool);
>> return ERR_PTR(ret);
>> }
> Can anyone look into this patch?
>
> Thanks
> Gen
>

The real question is whether this is actually an error at all.
pool->name doesn't seem to be used for anything but debug information,
and the printing code can perfectly accommodate a NULL pointer.

Thanks,

M.
--
Jazz is not dead. It just smells funny...

\
 
 \ /
  Last update: 2019-06-11 11:55    [W:0.060 / U:1.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site