[dpdk-stable] [PATCH] event: fix check in ring_init() in event ring code
Jerin Jacob
jerin.jacob at caviumnetworks.com
Thu Aug 2 14:43:22 CEST 2018
-----Original Message-----
> Date: Thu, 2 Aug 2018 09:36:04 +0100
> From: Harry van Haaren <harry.van.haaren at intel.com>
> To: dev at dpdk.org
> CC: Harry van Haaren <harry.van.haaren at intel.com>,
> bruce.richardson at intel.com, stable at dpdk.org, thomas at monjalon.net,
> jerin.jacob at caviumnetworks.com
> Subject: [PATCH] event: fix check in ring_init() in event ring code
> X-Mailer: git-send-email 2.7.4
>
> External Email
>
> This commit fixes a bug in a 32-bit environment where the
> generic ring_init() would fail, but given the interaction
> with memzones the next iteration of the event_ring_autotest
> would actually *pass* because the ring in question would
> exist already an be looked-up.
>
> This commit rightly error checks the result of ring_init(),
> and calls rte_free() on the memory as required.
>
> Fixes: dc39e2f359b5 ("eventdev: add ring structure for events")
> Cc: bruce.richardson at intel.com
> Cc: stable at dpdk.org
>
> Signed-off-by: Harry van Haaren <harry.van.haaren at intel.com>
There is one check-git-log.sh issue
Wrong headline format:
event: fix check in ring_init() in event ring code
>
> ---
>
> Cc: thomas at monjalon.net
> Cc: jerin.jacob at caviumnetworks.com
>
> Please consider this for RC3, as it fixes the unit tests
> on 32-bit systems.
> ---
> lib/librte_eventdev/rte_event_ring.c | 13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/lib/librte_eventdev/rte_event_ring.c b/lib/librte_eventdev/rte_event_ring.c
> index eb67751..5791928 100644
> --- a/lib/librte_eventdev/rte_event_ring.c
> +++ b/lib/librte_eventdev/rte_event_ring.c
> @@ -82,11 +82,14 @@ rte_event_ring_create(const char *name, unsigned int count, int socket_id,
> mz = rte_memzone_reserve(mz_name, ring_size, socket_id, mz_flags);
> if (mz != NULL) {
> r = mz->addr;
> - /*
> - * no need to check return value here, we already checked the
> - * arguments above
> - */
> - rte_event_ring_init(r, name, requested_count, flags);
> + /* Check return value in case rte_ring_init() fails on size */
> + int err = rte_event_ring_init(r, name, requested_count, flags);
> + if (err) {
> + RTE_LOG(ERR, RING, "Ring init failed\n");
shouldn't we do rte_memzone_free(mz);
> + rte_free(te);
> + rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
> + return 0;
It should be return NULL?
> + }
>
With above changes:
Acked-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
> te->data = (void *) r;
> r->r.memzone = mz;
> --
> 2.7.4
>
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