patch 'net/iavf: fix crash when link is unstable' has been queued to stable release 23.11.3

[Xueming Li]

Hi,

FYI, your patch has been queued to stable release 23.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/30/24. 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://git.dpdk.org/dpdk-stable/log/?h=23.11-staging

This queued commit can be viewed at:
https://git.dpdk.org/dpdk-stable/commit/?h=23.11-staging&id=97d79944ae2b5d5736b2e7f5e643b4ad6be5fc25

Thanks.

Xueming Li <xuemingl at nvidia.com>

---
>From 97d79944ae2b5d5736b2e7f5e643b4ad6be5fc25 Mon Sep 17 00:00:00 2001
From: Kaiwen Deng <kaiwenx.deng at intel.com>
Date: Tue, 6 Aug 2024 08:35:27 +0800
Subject: [PATCH] net/iavf: fix crash when link is unstable
Cc: Xueming Li <xuemingl at nvidia.com>

[ upstream commit 57ed9ca61f44ffc3801f55c749347bd717834008 ]

Physical link instability may cause a core dump because unstable
physical links can result in a large number of link change events. Some
of these events may be captured by vf before vf resources are allocated,
and that will result in a core dump.

This commit will check if vf_res is invalid before dereferencing it.

Fixes: 5e03e316c753 ("net/iavf: handle virtchnl event message without interrupt")

Signed-off-by: Kaiwen Deng <kaiwenx.deng at intel.com>
Acked-by: Bruce Richardson <bruce.richardson at intel.com>
---
 drivers/net/iavf/iavf_vchnl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/iavf/iavf_vchnl.c b/drivers/net/iavf/iavf_vchnl.c
index 1111d30f57..8ca104c04e 100644
--- a/drivers/net/iavf/iavf_vchnl.c
+++ b/drivers/net/iavf/iavf_vchnl.c
@@ -255,8 +255,8 @@ iavf_read_msg_from_pf(struct iavf_adapter *adapter, uint16_t buf_len,
 		case VIRTCHNL_EVENT_LINK_CHANGE:
 			vf->link_up =
 				vpe->event_data.link_event.link_status;
-			if (vf->vf_res->vf_cap_flags &
-				VIRTCHNL_VF_CAP_ADV_LINK_SPEED) {
+			if (vf->vf_res != NULL &&
+			    vf->vf_res->vf_cap_flags & VIRTCHNL_VF_CAP_ADV_LINK_SPEED) {
 				vf->link_speed =
 				    vpe->event_data.link_event_adv.link_speed;
 			} else {
--
2.34.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2024-11-11 14:23:07.770511586 +0800
+++ 0055-net-iavf-fix-crash-when-link-is-unstable.patch	2024-11-11 14:23:05.132192839 +0800
@@ -1 +1 @@
-From 57ed9ca61f44ffc3801f55c749347bd717834008 Mon Sep 17 00:00:00 2001
+From 97d79944ae2b5d5736b2e7f5e643b4ad6be5fc25 Mon Sep 17 00:00:00 2001
@@ -4,0 +5,3 @@
+Cc: Xueming Li <xuemingl at nvidia.com>
+
+[ upstream commit 57ed9ca61f44ffc3801f55c749347bd717834008 ]
@@ -14 +16,0 @@
-Cc: stable at dpdk.org
@@ -23 +25 @@
-index 6d5969f084..69420bc9b6 100644
+index 1111d30f57..8ca104c04e 100644