linux-kernel - [PATCH] SUNRPC: fix gss_auth kref leak in gss_alloc

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Message-ID: <20260206204146.21093-1-git@danielhodges.dev>
Date: Fri,  6 Feb 2026 15:41:46 -0500
From: Daniel Hodges <git@...ielhodges.dev>
To: chuck.lever@...cle.com,
	anna@...nel.org,
	trondmy@...nel.org
Cc: linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	jlayton@...nel.org,
	neil@...wn.name,
	okorniev@...hat.com,
	Daniel Hodges <git@...ielhodges.dev>,
	stable@...r.kernel.org
Subject: [PATCH] SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path

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@...r.kernel.org
Signed-off-by: Daniel Hodges <git@...ielhodges.dev>
---
 net/sunrpc/auth_gss/auth_gss.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 5c095cb8cb20..bb3c3db2713b 100644
--- 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_ops;
 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);
-- 
2.52.0