From: Jon Paul Maloy <jon.maloy@ericsson.com>
Date: Fri, 25 Jul 2014 18:48:09 +0000 (-0400)
Subject: tipc: make tipc_buf_append() more robust
X-Git-Tag: cleanup-for-v3.18~108^2~72
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=13e9b9972fa0f34059e737ae215a26e43966b46f;p=pandora-kernel.git

tipc: make tipc_buf_append() more robust

As per comment from David Miller, we try to make the buffer reassembly
function more resilient to user errors than it is today.

- We check that the "*buf" parameter always is set, since this is
  mandatory input.

- We ensure that *buf->next always is set to NULL before linking in
  the buffer, instead of relying of the caller to have done this.

- We ensure that the "tail" pointer in the head buffer's control
  block is initialized to NULL when the first fragment arrives.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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