FAILED: Patch "io_uring/cmd_net: fix too strict requirement on ioctl" failed to apply to 6.12-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 6.12-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 600b665b903733bd60334e86031b157cc823ee55 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Asbj=C3=B8rn=20Sloth=20T=C3=B8nnesen?= <ast@fiberby.net>
Date: Mon, 16 Feb 2026 10:27:18 +0000
Subject: [PATCH] io_uring/cmd_net: fix too strict requirement on ioctl
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Attempting SOCKET_URING_OP_SETSOCKOPT on an AF_NETLINK socket resulted
in an -EOPNOTSUPP, as AF_NETLINK doesn't have an ioctl in its struct
proto, but only in struct proto_ops.

Prior to the blamed commit, io_uring_cmd_sock() only had two cmd_op
operations, both requiring ioctl, thus the check was warranted.

Since then, 4 new cmd_op operations have been added, none of which
depend on ioctl. This patch moves the ioctl check, so it only applies
to the original operations.

AFAICT, the ioctl requirement was unintentional, and it wasn't
visible in the blamed patch within 3 lines of context.

Cc: stable@vger.kernel.org
Fixes: a5d2f99aff6b ("io_uring/cmd: Introduce SOCKET_URING_OP_GETSOCKOPT")
Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 io_uring/cmd_net.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/io_uring/cmd_net.c b/io_uring/cmd_net.c
index cb2775936fb84..57ddaf8746117 100644
--- a/io_uring/cmd_net.c
+++ b/io_uring/cmd_net.c
@@ -160,16 +160,19 @@ int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
 	struct proto *prot = READ_ONCE(sk->sk_prot);
 	int ret, arg = 0;
 
-	if (!prot || !prot->ioctl)
-		return -EOPNOTSUPP;
-
 	switch (cmd->cmd_op) {
 	case SOCKET_URING_OP_SIOCINQ:
+		if (!prot || !prot->ioctl)
+			return -EOPNOTSUPP;
+
 		ret = prot->ioctl(sk, SIOCINQ, &arg);
 		if (ret)
 			return ret;
 		return arg;
 	case SOCKET_URING_OP_SIOCOUTQ:
+		if (!prot || !prot->ioctl)
+			return -EOPNOTSUPP;
+
 		ret = prot->ioctl(sk, SIOCOUTQ, &arg);
 		if (ret)
 			return ret;
-- 
2.51.0