[dpdk-stable] patch 'vhost: fix crash on reconnect' has been queued to stable release 20.11.3

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 08/05/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/dc023498c91589402aa09462c279ae14684aee66

Thanks.

Luca Boccassi

---
>From dc023498c91589402aa09462c279ae14684aee66 Mon Sep 17 00:00:00 2001
From: Maxime Coquelin <maxime.coquelin at redhat.com>
Date: Mon, 26 Jul 2021 09:58:14 +0200
Subject: [PATCH] vhost: fix crash on reconnect

[ upstream commit 3c929a0bb3e7addc5103227bff126b8b9dd952ef ]

When the vhost-user frontend like Virtio-user tries to
reconnect to the restarted Vhost backend, the Vhost backend
segfaults when multiqueue is enabled.

This is caused by VHOST_USER_GET_VRING_BASE being called for
a virtqueue that has not been created before, causing a NULL
pointer dereferencing.

This patch adds the VHOST_USER_GET_VRING_BASE requests to
the list of requests that trigger queue pair allocations.

Fixes: 160cbc815b41 ("vhost: remove a hack on queue allocation")

Reported-by: Yinan Wang <yinan.wang at intel.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
Tested-by: Yinan Wang <yinan.wang at intel.com>
Reviewed-by: Chenbo Xia <chenbo.xia at intel.com>
---
 lib/librte_vhost/vhost_user.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 9b1a6d7697..8a2a3e9ab5 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -2677,6 +2677,7 @@ vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev,
 		break;
 	case VHOST_USER_SET_VRING_NUM:
 	case VHOST_USER_SET_VRING_BASE:
+	case VHOST_USER_GET_VRING_BASE:
 	case VHOST_USER_SET_VRING_ENABLE:
 		vring_idx = msg->payload.state.index;
 		break;
-- 
2.30.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-08-03 12:35:08.318681630 +0100
+++ 0002-vhost-fix-crash-on-reconnect.patch	2021-08-03 12:35:08.166817770 +0100
@@ -1 +1 @@
-From 3c929a0bb3e7addc5103227bff126b8b9dd952ef Mon Sep 17 00:00:00 2001
+From dc023498c91589402aa09462c279ae14684aee66 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 3c929a0bb3e7addc5103227bff126b8b9dd952ef ]
+
@@ -18 +19,0 @@
-Cc: stable at dpdk.org
@@ -25 +26 @@
- lib/vhost/vhost_user.c | 1 +
+ lib/librte_vhost/vhost_user.c | 1 +
@@ -28,5 +29,5 @@
-diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
-index 433f412fa8..29a4c9af60 100644
---- a/lib/vhost/vhost_user.c
-+++ b/lib/vhost/vhost_user.c
-@@ -2796,6 +2796,7 @@ vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev,
+diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
+index 9b1a6d7697..8a2a3e9ab5 100644
+--- a/lib/librte_vhost/vhost_user.c
++++ b/lib/librte_vhost/vhost_user.c
+@@ -2677,6 +2677,7 @@ vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev,