FAILED: Patch "NTB: ntb_transport: Fix too small buffer for debugfs_name" failed to apply to 6.6-stable tree

FAILED: Patch "NTB: ntb_transport: Fix too small buffer for debugfs_name" failed to apply to 6.6-stable tree

[Sasha Levin]

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 6a4b50585d74fe45d3ade1e3e86ba8aae79761a5 Mon Sep 17 00:00:00 2001
From: Koichiro Den <den@valinux.co.jp>
Date: Wed, 7 Jan 2026 13:24:57 +0900
Subject: [PATCH] NTB: ntb_transport: Fix too small buffer for debugfs_name

The buffer used for "qp%d" was only 4 bytes, which truncates names like
"qp10" to "qp1" and causes multiple queues to share the same directory.

Enlarge the buffer and use sizeof() to avoid truncation.

Fixes: fce8a7bb5b4b ("PCI-Express Non-Transparent Bridge Support")
Cc: <stable@vger.kernel.org> # v3.9+
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
---
 drivers/ntb/ntb_transport.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index a7dd983adf7b0..50f3b1f1b9262 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -1252,9 +1252,9 @@ static int ntb_transport_init_queue(struct ntb_transport_ctx *nt,
 	qp->tx_max_entry = tx_size / qp->tx_max_frame;
 
 	if (nt->debugfs_node_dir) {
-		char debugfs_name[4];
+		char debugfs_name[8];
 
-		snprintf(debugfs_name, 4, "qp%d", qp_num);
+		snprintf(debugfs_name, sizeof(debugfs_name), "qp%d", qp_num);
 		qp->debugfs_dir = debugfs_create_dir(debugfs_name,
 						     nt->debugfs_node_dir);
 
-- 
2.51.0