linux-kernel - [PATCH 4.14 172/222] lockd: fix access beyond unterminated strings in prints

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Date:   Sun, 11 Nov 2018 14:24:29 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Amir Goldstein <amir73il@...il.com>,
        "J. Bruce Fields" <bfields@...hat.com>
Subject: [PATCH 4.14 172/222] lockd: fix access beyond unterminated strings in prints

4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: Amir Goldstein <amir73il@...il.com>

commit 93f38b6fae0ea8987e22d9e6c38f8dfdccd867ee upstream.

printk format used %*s instead of %.*s, so hostname_len does not limit
the number of bytes accessed from hostname.

Signed-off-by: Amir Goldstein <amir73il@...il.com>
Cc: stable@...r.kernel.org
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/lockd/host.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -341,7 +341,7 @@ struct nlm_host *nlmsvc_lookup_host(cons
 	};
 	struct lockd_net *ln = net_generic(net, lockd_net_id);
 
-	dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__,
+	dprintk("lockd: %s(host='%.*s', vers=%u, proto=%s)\n", __func__,
 			(int)hostname_len, hostname, rqstp->rq_vers,
 			(rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp"));