inet: fix races with reqsk timers

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[ Upstream commit 2235f2ac75 ]

reqsk_queue_destroy() and reqsk_queue_unlink() should use
del_timer_sync() instead of del_timer() before calling reqsk_put(),
otherwise we could free a req still used by another cpu.

But before doing so, reqsk_queue_destroy() must release syn_wait_lock
spinlock or risk a dead lock, as reqsk_timer_handler() might
need to take this same spinlock from reqsk_queue_unlink() (called from
inet_csk_reqsk_queue_drop())

Fixes: fa76ce7328 ("inet: get rid of central tcp/dccp listener timer")
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>

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Eric Dumazet 2015-08-10 09:09:13 -07:00 • committed by Greg Kroah-Hartman

parent d36f8434da

commit 0c1122ae61

2 changed files with 8 additions and 2 deletions

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8

net/core/request_sock.c

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2

net/ipv4/inet_connection_sock.c

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