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The buggy scenario constructed by syzkaller was something like: (1) create a TCP socket (2) initiate a TFO connect via sendto() (3) while socket is in TCP_SYN_SENT, call setsockopt(TCP_CONGESTION),     which calls:        tcp_set_congestion_control() ->          tcp_reinit_congestion_control() ->            tcp_init_congestion_control() (4) receive ACK, connection is established, call tcp_init_transfer(),     set icsk_ca_initialized=0 (without first calling cc->release()),     call tcp_init_congestion_control() again. Note that in this sequence tcp_init_congestion_control() is called twice without a cc->release() call in between. Thus, for CC modules that allocate memory in their init() function, e.g, CDG, a memory leak may occur. The syzkaller tool managed to find a reproducer that triggered such a leak in CDG. 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