patch 'baseband/fpga_5gnr_fec: fix possible division by zero' has been queued to stable release 20.11.9

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.9

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 07/16/23. 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/b0f21e624de5ecef959fa6799b0d23d54818cd5d

Thanks.

Luca Boccassi

---
>From b0f21e624de5ecef959fa6799b0d23d54818cd5d Mon Sep 17 00:00:00 2001
From: Hernan Vargas <hernan.vargas at intel.com>
Date: Thu, 25 May 2023 11:28:07 -0700
Subject: [PATCH] baseband/fpga_5gnr_fec: fix possible division by zero

[ upstream commit 8b087b96eaa9df8d09fcea9a2a690e2c422058a5 ]

Add fix to have an early exit when z_c is zero to prevent a possible
division by zero.

Fixes: 44dc6faa796f ("baseband/fpga_5gnr_fec: add LDPC processing functions")

Signed-off-by: Hernan Vargas <hernan.vargas at intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c b/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c
index bd99fb4881..04c16f80fb 100644
--- a/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c
+++ b/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c
@@ -878,9 +878,11 @@ check_desc_error(uint32_t error_code) {
 static inline uint16_t
 get_k0(uint16_t n_cb, uint16_t z_c, uint8_t bg, uint8_t rv_index)
 {
-	if (rv_index == 0)
-		return 0;
 	uint16_t n = (bg == 1 ? N_ZC_1 : N_ZC_2) * z_c;
+	if (rv_index == 0)
+		return 0;
+	if (z_c == 0)
+		return 0;
 	if (n_cb == n) {
 		if (rv_index == 1)
 			return (bg == 1 ? K0_1_1 : K0_1_2) * z_c;
-- 
2.39.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2023-07-14 23:33:09.015950749 +0100
+++ 0012-baseband-fpga_5gnr_fec-fix-possible-division-by-zero.patch	2023-07-14 23:33:08.499305343 +0100
@@ -1 +1 @@
-From 8b087b96eaa9df8d09fcea9a2a690e2c422058a5 Mon Sep 17 00:00:00 2001
+From b0f21e624de5ecef959fa6799b0d23d54818cd5d Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 8b087b96eaa9df8d09fcea9a2a690e2c422058a5 ]
+
@@ -10 +11,0 @@
-Cc: stable at dpdk.org
@@ -19 +20 @@
-index f29565af8c..99390c4816 100644
+index bd99fb4881..04c16f80fb 100644
@@ -22 +23 @@
-@@ -877,9 +877,11 @@ check_desc_error(uint32_t error_code) {
+@@ -878,9 +878,11 @@ check_desc_error(uint32_t error_code) {