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| author |   Eric Dumazet <edumazet@google.com> | 2015-08-10 09:09:13 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-08-10 21:17:29 -0700 |
| commit | 2235f2ac75fd2501c251b0b699a9632e80239a6d (patch) | |
| tree | 1d332db260b2a933ac42386c254d0d14163a1d84 /net/ipv4/inet_connection_sock.c | |
| parent | mkiss: Fix error handling in mkiss_open() (diff) | |
| download | linux-dev-2235f2ac75fd2501c251b0b699a9632e80239a6d.tar.xz linux-dev-2235f2ac75fd2501c251b0b699a9632e80239a6d.zip | |
inet: fix races with reqsk timers
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: fa76ce7328b2 ("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>
Diffstat (limited to 'net/ipv4/inet_connection_sock.c')
| -rw-r--r-- | net/ipv4/inet_connection_sock.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index 60021d0d9326..05e3145f7dc3 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -593,7 +593,7 @@ static bool reqsk_queue_unlink(struct request_sock_queue *queue, } spin_unlock(&queue->syn_wait_lock); - if (del_timer(&req->rsk_timer)) + if (del_timer_sync(&req->rsk_timer)) reqsk_put(req); return found; } |