ipv6: tcp: add rcu locking in tcp_v6_send_synack()

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commit 3e4006f0b8 upstream.

When first SYNACK is sent, we already hold rcu_read_lock(), but this
is not true if a SYNACK is retransmitted, as a timer (soft) interrupt
does not hold rcu_read_lock()

Fixes: 45f6fad84c ("ipv6: add complete rcu protection around np->opt")
Reported-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

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Eric Dumazet 2016-01-08 09:35:51 -08:00 • committed by Luis Henriques

parent 1b687f7e66

commit 2e0009900a

1 changed files with 2 additions and 0 deletions

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net/ipv6/tcp_ipv6.c

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