[dpdk-dev] [PATCH v2] lib/efd: fix to free tail queue entry after use
Maxime Coquelin
maxime.coquelin at redhat.com
Fri Nov 23 15:39:01 CET 2018
On 11/23/18 2:30 PM, Maxime Coquelin wrote:
>
>
> On 11/14/18 12:17 PM, Hari Kumar Vemula wrote:
>> In rte_efd_create() allocated memory for tail queue entry but
>> not freed.
>> Added freeing the tail queue entry.
>>
>> Fixes: 56b6ef874f80 ("efd: new Elastic Flow Distributor library")
>> Cc: stable at dpdk.org
>>
>> Signed-off-by: Hari Kumar Vemula <hari.kumarx.vemula at intel.com>
>> Acked-by: Reshma Pattan <reshma.pattan at intel.com>
>>
>> ---
>> v2: Updated commit message.
>> ---
>>
>> lib/librte_efd/rte_efd.c | 21 +++++++++++++++++++++
>> 1 file changed, 21 insertions(+)
>>
>> diff --git a/lib/librte_efd/rte_efd.c b/lib/librte_efd/rte_efd.c
>> index a780e2fe8..f8c6c447f 100644
>> --- a/lib/librte_efd/rte_efd.c
>> +++ b/lib/librte_efd/rte_efd.c
>> @@ -739,17 +739,38 @@ void
>> rte_efd_free(struct rte_efd_table *table)
>> {
>> uint8_t socket_id;
>> + struct rte_efd_list *efd_list = NULL;
>
> NULL init seems useless here.
>
>> + struct rte_tailq_entry *te;
>> if (table == NULL)
>> return;
>> + efd_list = RTE_TAILQ_CAST(rte_efd_tailq.head, rte_efd_list);
>> +
>> for (socket_id = 0; socket_id < RTE_MAX_NUMA_NODES; socket_id++)
>> rte_free(table->chunks[socket_id]);
>> + rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
>> +
>> + /* find our tailq entry */
>> + TAILQ_FOREACH(te, efd_list, next) {
>> + if (te->data == (void *) table)
>> + break;
>> + }
>> +
>> + if (te == NULL) {
>> + rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
>> + return;
And in this case, I think there is a leak, as all table stuffs don't get
freed.
>> + }
>> +
>> + TAILQ_REMOVE(efd_list, te, next);
>> + rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
>
> Wouldn't this be simpler by using TAILQ_FOREACH_SAFE() instead?
> The element could removed from the list and freed within the loop.
>
>> +
>> rte_ring_free(table->free_slots);
>> rte_free(table->offline_chunks);
>> rte_free(table->keys);
>> rte_free(table);
>> + rte_free(te);
>> }
>> /**
>>
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