From: Eric Dumazet <edumazet@google.com>
Date: Wed, 22 Apr 2015 01:32:24 +0000 (-0700)
Subject: tcp: fix possible deadlock in tcp_send_fin()
X-Git-Tag: omap-for-v4.2/omap1-v2~58^2~34
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d83769a580f1132ac26439f50068a29b02be535e;p=pandora-kernel.git

tcp: fix possible deadlock in tcp_send_fin()

Using sk_stream_alloc_skb() in tcp_send_fin() is dangerous in
case a huge process is killed by OOM, and tcp_mem[2] is hit.

To be able to free memory we need to make progress, so this
patch allows FIN packets to not care about tcp_mem[2], if
skb allocation succeeded.

In a follow-up patch, we might abort tcp_send_fin() infinite loop
in case TIF_MEMDIE is set on this thread, as memory allocator
did its best getting extra memory already.

This patch reverts d22e15371811 ("tcp: fix tcp fin memory accounting")

Fixes: d22e15371811 ("tcp: fix tcp fin memory accounting")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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