linux-kernel - [PATCH][next] 6lowpan: fix off-by-one comparison of index id with LOWPAN_IPHC_CTX_TABLE

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Message-Id: <20190624144757.1285-1-colin.king@canonical.com>
Date:   Mon, 24 Jun 2019 15:47:57 +0100
From:   Colin King <colin.king@...onical.com>
To:     Alexander Aring <alex.aring@...il.com>,
        Jukka Rissanen <jukka.rissanen@...ux.intel.com>,
        "David S . Miller" <davem@...emloft.net>,
        linux-bluetooth@...r.kernel.org, linux-wpan@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] 6lowpan: fix off-by-one comparison of index id with LOWPAN_IPHC_CTX_TABLE_SIZE

From: Colin Ian King <colin.king@...onical.com>

The WARN_ON_ONCE check on id is off-by-one, it should be greater or equal
to LOWPAN_IPHC_CTX_TABLE_SIZE and not greater than. Fix this.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 net/6lowpan/debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/6lowpan/debugfs.c b/net/6lowpan/debugfs.c
index 1c140af06d52..a510bed8165b 100644
--- a/net/6lowpan/debugfs.c
+++ b/net/6lowpan/debugfs.c
@@ -170,7 +170,7 @@ static void lowpan_dev_debugfs_ctx_init(struct net_device *dev,
 	struct dentry *root;
 	char buf[32];
 
-	WARN_ON_ONCE(id > LOWPAN_IPHC_CTX_TABLE_SIZE);
+	WARN_ON_ONCE(id >= LOWPAN_IPHC_CTX_TABLE_SIZE);
 
 	sprintf(buf, "%d", id);
 
-- 
2.20.1