patch 'net/tap: free IPC reply buffer on queue count mismatch' has been queued to stable release 23.11.7

[Shani Peretz]

Hi,

FYI, your patch has been queued to stable release 23.11.7

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 04/19/26. 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/shanipr/dpdk-stable

This queued commit can be viewed at:
https://github.com/shanipr/dpdk-stable/commit/76a40b1972146243f034fa9468044921bf005b1e

Thanks.

Shani

---
>From 76a40b1972146243f034fa9468044921bf005b1e Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <stephen at networkplumber.org>
Date: Sun, 22 Feb 2026 09:30:45 -0800
Subject: [PATCH] net/tap: free IPC reply buffer on queue count mismatch

[ upstream commit 86a3ffe64f4e2cdde9ebe9c05b737a185c77034a ]

In tap_mp_attach_queues(), if the reply queue count does not match
the number of received file descriptors, the function returns -1
without freeing the reply buffer allocated by rte_mp_request_sync().
Add the missing free().

Bugzilla ID: 1881
Fixes: 9ad43ad8fbee ("net/tap: fix potential IPC buffer overrun")

Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
---
 drivers/net/tap/rte_eth_tap.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 4510674ce9..a7c48f3466 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -2352,6 +2352,7 @@ tap_mp_attach_queues(const char *port_name, struct rte_eth_dev *dev)
 	/* Attach the queues from received file descriptors */
 	if (reply_param->rxq_count + reply_param->txq_count != reply->num_fds) {
 		TAP_LOG(ERR, "Unexpected number of fds received");
+		free(reply);
 		return -1;
 	}
 
-- 
2.43.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2026-04-14 14:44:31.479088424 +0300
+++ 0026-net-tap-free-IPC-reply-buffer-on-queue-count-mismatc.patch	2026-04-14 14:44:28.525463000 +0300
@@ -1 +1 @@
-From 86a3ffe64f4e2cdde9ebe9c05b737a185c77034a Mon Sep 17 00:00:00 2001
+From 76a40b1972146243f034fa9468044921bf005b1e Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 86a3ffe64f4e2cdde9ebe9c05b737a185c77034a ]
+
@@ -13 +14,0 @@
-Cc: stable at dpdk.org
@@ -21 +22 @@
-index 63d5ac5630..93c93cd33d 100644
+index 4510674ce9..a7c48f3466 100644
@@ -24 +25 @@
-@@ -2374,6 +2374,7 @@ tap_mp_attach_queues(const char *port_name, struct rte_eth_dev *dev)
+@@ -2352,6 +2352,7 @@ tap_mp_attach_queues(const char *port_name, struct rte_eth_dev *dev)
@@ -26 +27 @@
- 	if (reply_param->q_count != reply->num_fds) {
+ 	if (reply_param->rxq_count + reply_param->txq_count != reply->num_fds) {