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tcp: verify the checksum of the first data segment in a new connection
[ Upstream commit 4fd44a9 ] commit 079096f ("tcp/dccp: install syn_recv requests into ehash table") introduced an optimization for the handling of child sockets created for a new TCP connection. But this optimization passes any data associated with the last ACK of the connection handshake up the stack without verifying its checksum, because it calls tcp_child_process(), which in turn calls tcp_rcv_state_process() directly. These lower-level processing functions do not do any checksum verification. Insert a tcp_checksum_complete call in the TCP_NEW_SYN_RECEIVE path to fix this. Fixes: 079096f ("tcp/dccp: install syn_recv requests into ehash table") Signed-off-by: Frank van der Linden <[email protected]> Signed-off-by: Eric Dumazet <[email protected]> Tested-by: Balbir Singh <[email protected]> Reviewed-by: Balbir Singh <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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