linux-kernel - [PATCH AUTOSEL 6.6 2/2] NFS: Fix potential buffer overflowin nfs_sysfs_link_rpc

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Message-Id: <20250129125958.1273172-2-sashal@kernel.org>
Date: Wed, 29 Jan 2025 07:59:55 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Zichen Xie <zichenxie0106@...il.com>,
	Benjamin Coddington <bcodding@...hat.com>,
	Anna Schumaker <anna.schumaker@...cle.com>,
	Sasha Levin <sashal@...nel.org>,
	trondmy@...nel.org,
	anna@...nel.org,
	linux-nfs@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 2/2] NFS: Fix potential buffer overflowin nfs_sysfs_link_rpc_client()

From: Zichen Xie <zichenxie0106@...il.com>

[ Upstream commit 49fd4e34751e90e6df009b70cd0659dc839e7ca8 ]

name is char[64] where the size of clnt->cl_program->name remains
unknown. Invoking strcat() directly will also lead to potential buffer
overflow. Change them to strscpy() and strncat() to fix potential
issues.

Signed-off-by: Zichen Xie <zichenxie0106@...il.com>
Reviewed-by: Benjamin Coddington <bcodding@...hat.com>
Signed-off-by: Anna Schumaker <anna.schumaker@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfs/sysfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/nfs/sysfs.c b/fs/nfs/sysfs.c
index bf378ecd5d9fd..7b59a40d40c06 100644
--- a/fs/nfs/sysfs.c
+++ b/fs/nfs/sysfs.c
@@ -280,9 +280,9 @@ void nfs_sysfs_link_rpc_client(struct nfs_server *server,
 	char name[RPC_CLIENT_NAME_SIZE];
 	int ret;
 
-	strcpy(name, clnt->cl_program->name);
-	strcat(name, uniq ? uniq : "");
-	strcat(name, "_client");
+	strscpy(name, clnt->cl_program->name, sizeof(name));
+	strncat(name, uniq ? uniq : "", sizeof(name) - strlen(name) - 1);
+	strncat(name, "_client", sizeof(name) - strlen(name) - 1);
 
 	ret = sysfs_create_link_nowarn(&server->kobj,
 						&clnt->cl_sysfs->kobject, name);
-- 
2.39.5