From: Stephen Hemminger <stephen@networkplumber.org>
To: netdev@vger.kernel.org
Subject: Fw: [Bug 198353] New: Generic netlink family bug when multicast groups are greater than 13
Date: Thu, 4 Jan 2018 16:30:45 -0800 [thread overview]
Message-ID: <20180104163045.2dfee077@xeon-e3> (raw)
Begin forwarded message:
Date: Fri, 05 Jan 2018 00:21:42 +0000
From: bugzilla-daemon@bugzilla.kernel.org
To: stephen@networkplumber.org
Subject: [Bug 198353] New: Generic netlink family bug when multicast groups are greater than 13
https://bugzilla.kernel.org/show_bug.cgi?id=198353
Bug ID: 198353
Summary: Generic netlink family bug when multicast groups are
greater than 13
Product: Networking
Version: 2.5
Kernel Version: 4.4
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: blocking
Priority: P1
Component: Other
Assignee: stephen@networkplumber.org
Reporter: jaipal.katkuri@itron.com
Regression: No
Created attachment 273405
--> https://bugzilla.kernel.org/attachment.cgi?id=273405&action=edit
linux-4.4-netlink-genlmcgroup.patch
Kernel Version: 4.4
File: netlink/genetlink.c
While reserving multicast groups for a netlink family in the kernel, if the
request has more than 13 groups the code allocates only 13 groups and returns
success.
In the function "genl_allocate_reserve_groups" the variable "id" is returned
with the first available multicast group slot but it doesn't check if the
request "n_groups" is more than 13.
Attached patch fixes the problem.
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