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91934d4446
Commit0e24d17bd9("tcp: implement RFC 7323 window retraction receiver requirements") removed the special FIN case that was added in commit1e3bb184e9("tcp: re-enable acceptance of FIN packets when RWIN is 0"). If a peer sends a segment containing data and a FIN flag before it learns about our window retraction and has a buggy TCP stack, it might place the FIN one byte beyond what it thinks is the right edge of the window (i.e., max_window_edge + 1). The data portion (end_seq - th->fin) will end exactly at max_window_edge. In this case, we will drop the packet if our receive queue is not empty, even though the data was sent within the window we previously allowed. Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Neal Cardwell <ncardwell@google.com> Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com> Reviewed-by: Simon Baatz <gmbnomis@gmail.com> Link: https://patch.msgid.link/20260608151452.706822-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
7766 lines
226 KiB
7766 lines
226 KiB