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authorEric Dumazet <edumazet@google.com>2017-02-01 08:33:53 -0800
committerDavid S. Miller <davem@davemloft.net>2017-02-01 12:55:42 -0500
commit06425c308b92eaf60767bc71d359f4cbc7a561f8 (patch)
treea08cfa26bccb18c96d087ee257d8a99f0f804f53 /include
parent63117f09c768be05a0bf465911297dc76394f686 (diff)
tcp: fix 0 divide in __tcp_select_window()
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>
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