linux-kernel - [PATCH] L2CAP receive buffer overflow

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Date:   Tue, 14 Sep 2021 03:41:48 +0300
From:   Panin Kirill <s02200455@...d.cs.msu.ru>
To:     "marcel@...tmann.org johan.hedberg@...il.com luiz.dentz@...il.com
        davem@...emloft.net" <kuba@...nel.org>
Cc:     "linux-bluetooth@...r.kernel.org netdev@...r.kernel.org" 
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] L2CAP receive buffer overflow

 From 716e6b5b15eb5d7f87c799b545aeb5188128c36f Mon Sep 17 00:00:00 2001
 From: Kirill Panin <s02200455@...d.cs.msu.ru>
Date: Tue, 14 Sep 2021 02:41:58 +0300
Subject: [PATCH] Increase L2CAP default MTU.

Some Android devices transmit packets with length bigger than MTU.
For more information refer to: 
https://github.com/anonymix007/libldacdec/issues/1
Changes: Increase default MTU up to 688

Signed-off-by: Kirill Panin <s02200455@...d.cs.msu.ru>
---
  include/net/bluetooth/l2cap.h | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/bluetooth/l2cap.h 
b/include/net/bluetooth/l2cap.h
index 3c4f550e5a8b..db2a4ebc375b 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -31,7 +31,7 @@
  #include <linux/atomic.h>

  /* L2CAP defaults */
-#define L2CAP_DEFAULT_MTU		672
+#define L2CAP_DEFAULT_MTU		688
  #define L2CAP_DEFAULT_MIN_MTU		48
  #define L2CAP_DEFAULT_FLUSH_TO		0xFFFF
  #define L2CAP_EFS_DEFAULT_FLUSH_TO	0xFFFFFFFF
-- 
2.20.1