[PATCH 6.6.y] ipmi: fix refcount leak in i_ipmi_request()

[Sasha Levin <sashal@kernel.org>]

From: Wentao Liang <vulab@iscas.ac.cn>

[ Upstream commit a3f3859cecacb64f18fd446271ece9a3b3f2d4de ]

When a caller provides a `supplied_recv` message to i_ipmi_request(),
the function increments the user's `nr_msgs` reference count. If an
error occurs later, the out_err cleanup path only frees the recv_msg
if the function allocated it itself (i.e., !supplied_recv). In the
supplied_recv case the cleanup is skipped, leaving the reference count
elevated. The caller ipmi_request_supply_msgs() does not release the
supplied_recv on error, so the reference is permanently leaked.

Fix this by explicitly reverting the reference count operations when a
supplied recv_msg with a valid user pointer is present in the error
path: decrement nr_msgs and drop the user's kref.

Cc: stable@vger.kernel.org
Fixes: b52da4054ee0 ("ipmi: Rework user message limit handling")
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
Message-ID: <20260603120634.3758747-1-vulab@iscas.ac.cn>
Signed-off-by: Corey Minyard <corey@minyard.net>
[ changed `free_ipmi_user` to `free_user` in the two added `kref_put()` calls ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/char/ipmi/ipmi_msghandler.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 37b84bfa623e99..7dec2138b87445 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -2331,6 +2331,10 @@ static int i_ipmi_request(struct ipmi_user     *user,
 		if (smi_msg == NULL) {
 			if (!supplied_recv)
 				ipmi_free_recv_msg(recv_msg);
+			else if (recv_msg->user) {
+				atomic_dec(&recv_msg->user->nr_msgs);
+				kref_put(&recv_msg->user->refcount, free_user);
+			}
 			return -ENOMEM;
 		}
 	}
@@ -2373,6 +2377,10 @@ static int i_ipmi_request(struct ipmi_user     *user,
 			ipmi_free_smi_msg(smi_msg);
 		if (!supplied_recv)
 			ipmi_free_recv_msg(recv_msg);
+		else if (recv_msg->user) {
+			atomic_dec(&recv_msg->user->nr_msgs);
+			kref_put(&recv_msg->user->refcount, free_user);
+		}
 	} else {
 		dev_dbg(intf->si_dev, "Send: %*ph\n",
 			smi_msg->data_size, smi_msg->data);
-- 
2.53.0