tcp: avoid possible arithmetic overflows

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icsk_rto is a 32bit field, and icsk_backoff can reach 15 by default,
or more if some sysctl (eg tcp_retries2) are changed.

Better use 64bit to perform icsk_rto << icsk_backoff operations

As Joe Perches suggested, add a helper for this.

Yuchung spotted the tcp_v4_err() case.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric Dumazet 2014-09-22 13:19:44 -07:00 • committed by David S. Miller

parent 35f7aa5309

commit fcdd1cf4dd

5 changed files with 23 additions and 14 deletions

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9

include/net/inet_connection_sock.h

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