netdev - [PATCH] Bluetooth: increase BTNAMSIZ to 21 chars to fix potential buffer overflow

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Date:   Wed,  4 Aug 2021 16:09:51 +0100
From:   Colin King <colin.king@...onical.com>
To:     Karsten Keil <isdn@...ux-pingi.de>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Andrei Emeltchenko <andrei.emeltchenko@...el.com>,
        Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
        netdev@...r.kernel.org, linux-bluetooth@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Bluetooth: increase BTNAMSIZ to 21 chars to fix potential buffer overflow

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

An earlier commit replaced using batostr to using %pMR sprintf for the
construction of session->name. Static analysis detected that this new
method can use a total of 21 characters (including the trailing '\0')
so we need to increase the BTNAMSIZ from 18 to 21 to fix potential
buffer overflows.

Addresses-Coverity: ("Out-of-bounds write")
Fixes: fcb73338ed53 ("Bluetooth: Use %pMR in sprintf/seq_printf instead of batostr")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 net/bluetooth/cmtp/cmtp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/cmtp/cmtp.h b/net/bluetooth/cmtp/cmtp.h
index c32638dddbf9..f6b9dc4e408f 100644
--- a/net/bluetooth/cmtp/cmtp.h
+++ b/net/bluetooth/cmtp/cmtp.h
@@ -26,7 +26,7 @@
 #include <linux/types.h>
 #include <net/bluetooth/bluetooth.h>
 
-#define BTNAMSIZ 18
+#define BTNAMSIZ 21
 
 /* CMTP ioctl defines */
 #define CMTPCONNADD	_IOW('C', 200, int)
-- 
2.31.1