[dpdk-stable] patch 'event: fix ring init failure handling' has been queued to stable release 18.05.1

[Christian Ehrhardt]

Hi,

FYI, your patch has been queued to stable release 18.05.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 08/16/18. So please
shout if anyone has objections.

Thanks.

Christian Ehrhardt <christian.ehrhardt at canonical.com>

---
>From 3ecf5f23f9e6ddbeb50f2384e673a9ffa6a932fa Mon Sep 17 00:00:00 2001
From: Harry van Haaren <harry.van.haaren at intel.com>
Date: Thu, 2 Aug 2018 15:43:29 +0100
Subject: [PATCH] event: fix ring init failure handling

[ upstream commit 219ae4a12995e5a8ee5e184655a37dd4ee96bf25 ]

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")

Signed-off-by: Harry van Haaren <harry.van.haaren at intel.com>
Acked-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
---
 lib/librte_eventdev/rte_event_ring.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/lib/librte_eventdev/rte_event_ring.c b/lib/librte_eventdev/rte_event_ring.c
index eb67751dc..16d02a953 100644
--- a/lib/librte_eventdev/rte_event_ring.c
+++ b/lib/librte_eventdev/rte_event_ring.c
@@ -82,11 +82,16 @@ 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");
+			if (rte_memzone_free(mz) != 0)
+				RTE_LOG(ERR, RING, "Cannot free memzone\n");
+			rte_free(te);
+			rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+			return NULL;
+		}
 
 		te->data = (void *) r;
 		r->r.memzone = mz;
-- 
2.17.1