[PATCH 4.4 14/37] tcp: avoid integer overflows in tcp_rcv_space_adjust()

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Eric Dumazet commit 607065bad9931e72207b0cac365d7d4abc06bd99 upstream. When using large tcp_rmem[2] values (I did tests with 500 MB), I noticed overflows while computing rcvwin. Lets fix this

[PATCH 4.4 14/37] tcp: avoid integer overflows in tcp_rcv_space_adjust()

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Eric Dumazet commit 607065bad9931e72207b0cac365d7d4abc06bd99 upstream. When using large tcp_rmem[2] values (I did tests with 500 MB), I noticed overflows while computing rcvwin. Lets fix this