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authorEric Dumazet <edumazet@google.com>2015-08-10 19:09:13 +0300
committerDavid S. Miller <davem@davemloft.net>2015-08-11 07:17:29 +0300
commit2235f2ac75fd2501c251b0b699a9632e80239a6d (patch)
tree1d332db260b2a933ac42386c254d0d14163a1d84 /net/ipv4
parent9d332d92a95c9c67abe08b5f7cba64d8fc1e3c76 (diff)
downloadlinux-2235f2ac75fd2501c251b0b699a9632e80239a6d.tar.xz
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')
-rw-r--r--net/ipv4/inet_connection_sock.c2
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;
}