From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	patches@lists.linux.dev,
	Daniel Hodges <git@danielhodges.dev>,
	Anna Schumaker <anna.schumaker@oracle.com>
Subject: [PATCH 6.18 626/641] SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path
Date: Tue, 24 Feb 2026 17:25:52 -0800
Message-ID: <20260225012403.674148372@linuxfoundation.org>
In-Reply-To: <20260225012348.915798704@linuxfoundation.org>
References: <20260225012348.915798704@linuxfoundation.org>
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6.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Hodges <git@danielhodges.dev>

commit dd2fdc3504592d85e549c523b054898a036a6afe upstream.

Commit 5940d1cf9f42 ("SUNRPC: Rebalance a kref in auth_gss.c") added
a kref_get(&gss_auth->kref) call to balance the gss_put_auth() done
in gss_release_msg(), but forgot to add a corresponding kref_put()
on the error path when kstrdup_const() fails.

If service_name is non-NULL and kstrdup_const() fails, the function
jumps to err_put_pipe_version which calls put_pipe_version() and
kfree(gss_msg), but never releases the gss_auth reference. This leads
to a kref leak where the gss_auth structure is never freed.

Add a forward declaration for gss_free_callback() and call kref_put()
in the err_put_pipe_version error path to properly release the
reference taken earlier.

Fixes: 5940d1cf9f42 ("SUNRPC: Rebalance a kref in auth_gss.c")
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Hodges <git@danielhodges.dev>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sunrpc/auth_gss/auth_gss.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -39,6 +39,8 @@ static const struct rpc_authops authgss_
 static const struct rpc_credops gss_credops;
 static const struct rpc_credops gss_nullops;
 
+static void gss_free_callback(struct kref *kref);
+
 #define GSS_RETRY_EXPIRED 5
 static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;
 
@@ -551,6 +553,7 @@ gss_alloc_msg(struct gss_auth *gss_auth,
 	}
 	return gss_msg;
 err_put_pipe_version:
+	kref_put(&gss_auth->kref, gss_free_callback);
 	put_pipe_version(gss_auth->net);
 err_free_msg:
 	kfree(gss_msg);