From: Eric Dumazet <edumazet@google.com>
Date: Wed, 1 Feb 2017 16:33:53 +0000 (-0800)
Subject: tcp: fix 0 divide in __tcp_select_window()
X-Git-Tag: v3.2.87~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=35558f807792c21900e23046d97d7c6458f48c75;p=pandora-kernel.git

tcp: fix 0 divide in __tcp_select_window()

[ Upstream commit 06425c308b92eaf60767bc71d359f4cbc7a561f8 ]

syszkaller fuzzer was able to trigger a divide by zero, when
TCP window scaling is not enabled.

SO_RCVBUF can be used not only to increase sk_rcvbuf, also
to decrease it below current receive buffers utilization.

If mss is negative or 0, just return a zero TCP window.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Dmitry Vyukov  <dvyukov@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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