Re: [PATCH] net: mlx5: Add a missing check on idr_find

From: Boris Pismenny
Date: Tue Mar 19 2019 - 11:00:52 EST

Hi Leon,

On 3/19/2019 4:35 PM, Leon Romanovsky wrote:
> On Tue, Mar 19, 2019 at 01:41:49PM +0000, Boris Pismenny wrote:
>> On 3/19/2019 12:18 AM, Aditya Pakki wrote:
>>> idr_find() can return a NULL value to 'flow' which is used without a check.
>>> The patch adds a check to avoid potential NULL pointer dereference.
>> Did you encounter this in practice?
>> This flow you are suggesting shouldn't be possible, because the handle
>> is always there until the socket is destroyed in sk_destruct.
>> But, I wouldn't mind some defensive coding here.
>> Maybe also a WARN_ONCE :)
>> Could you also release buf in case of an error returned from
>> mlx5_fpga_sbu_conn_sendmsg below?
>> Otherwise, I could submit a patch for this.
> Boris,
> Can you please invest ten seconds to read previous emails prior to answering?
The fix you suggested is valid and should be addressed as well.

I didn't comment on your reply, but it doesn't mean that I disagree.