Subject: Fw: [Bug 198353] New: Generic netlink family bug when multicast groups are greater than 13

From: Stephen Hemminger <[email-masked]>
Date: Thu, 4 Jan 2018 16:30:45 -0800

Begin forwarded message:

Date: Fri, 05 Jan 2018 00:21:42 +0000
From: [email-masked]
To: [email-masked]
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: [email-masked]
          Reporter: [email-masked]
        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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