tcp: fix 0 divide in __tcp_select_window()
commit 06425c30 upstream. syszkaller fuzzer was able to trigger a divide by zero, when TCP window scaling is not enabled. SO_RCVBUF can be used not only to increase sk_rcvbuf, also to decrease it below current receive buffers utilization. If mss is negative or 0, just return a zero TCP window. Signed-off-by:Eric Dumazet <edumazet@google.com> Reported-by:
Dmitry Vyukov <dvyukov@google.com> Acked-by:
Neal Cardwell <ncardwell@google.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Willy Tarreau <w@1wt.eu>
Showing
Please register or sign in to comment