Re: [PATCH] selinux: fix memory leak on node_ptr on error return path

From: Colin Ian King
Date: Tue Mar 22 2016 - 17:38:24 EST

On 22/03/16 21:35, Paul Moore wrote:
> On Tue, Mar 22, 2016 at 4:28 PM, Serge E. Hallyn <serge@xxxxxxxxxx> wrote:
>> Quoting Colin King (colin.king@xxxxxxxxxxxxx):
>>> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>>> node_ptr is not being free'd if the list allocation fails, fix
>>> this by kfree'ing it before exiting on the error path.
>>> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>> Hi,
>> I'm not very familiar with this code any more, but are you sure
>> this is needed and doesn't cause a new bug? It *looks* like
>> the avtab_insert_nonunique() actually inserts the node_ptr
>> into the policydb, and the policydb is the one that should
>> eventually free it.
> Exactly. cond_insertf() calls avtab_insert_nonunique() which calls
> avtab_insert_node() which adds the node to the avtab. The avtab will
> get cleaned up later by the error handling code in the cond_insertf()
> call chain.
My bad, apologies.