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| author | Eric Dumazet <edumazet@google.com> | 2015-04-21 18:32:24 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-06 21:56:20 +0200 |
| commit | aac9fda375bbe75e0b8c033874af25e0f7f5a3a4 (patch) | |
| tree | 2937341d32859675019e9a5d34739f66b4f8e69a /arch/arm/Kconfig | |
| parent | fb138c4699c94b16bf9400394142c6d86fe70226 (diff) | |
| download | lwn-aac9fda375bbe75e0b8c033874af25e0f7f5a3a4.tar.gz lwn-aac9fda375bbe75e0b8c033874af25e0f7f5a3a4.zip | |
tcp: fix possible deadlock in tcp_send_fin()
[ Upstream commit d83769a580f1132ac26439f50068a29b02be535e ]
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/Kconfig')
0 files changed, 0 insertions, 0 deletions