Patch "Bluetooth: Fix potential buffer overflow with Add Advertising" has been added to the 4.5-stable tree

Patch "Bluetooth: Fix potential buffer overflow with Add Advertising" has been added to the 4.5-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Bluetooth: Fix potential buffer overflow with Add Advertising

to the 4.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     bluetooth-fix-potential-buffer-overflow-with-add-advertising.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 6a0e78072c2ae7b20b14e0249d8108441ea928d2 Mon Sep 17 00:00:00 2001
From: Johan Hedberg <johan.hedberg@intel.com>
Date: Fri, 11 Mar 2016 09:56:33 +0200
Subject: Bluetooth: Fix potential buffer overflow with Add Advertising

From: Johan Hedberg <johan.hedberg@intel.com>

commit 6a0e78072c2ae7b20b14e0249d8108441ea928d2 upstream.

The Add Advertising command handler does the appropriate checks for
the AD and Scan Response data, however fails to take into account the
general length of the mgmt command itself, which could lead to
potential buffer overflows. This patch adds the necessary check that
the mgmt command length is consistent with the given ad and scan_rsp
lengths.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/bluetooth/mgmt.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -5979,6 +5979,10 @@ static int add_advertising(struct sock *
 		return mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_ADVERTISING,
 				       MGMT_STATUS_INVALID_PARAMS);
 
+	if (data_len != sizeof(*cp) + cp->adv_data_len + cp->scan_rsp_len)
+		return mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_ADVERTISING,
+				       MGMT_STATUS_INVALID_PARAMS);
+
 	flags = __le32_to_cpu(cp->flags);
 	timeout = __le16_to_cpu(cp->timeout);
 	duration = __le16_to_cpu(cp->duration);


Patches currently in stable-queue which might be from johan.hedberg@intel.com are

queue-4.5/bluetooth-fix-potential-buffer-overflow-with-add-advertising.patch