Re: [PATCH v4.4.y..v4.14.y] tcp: avoid integer overflows in tcp_rcv_space_adjust()

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On Wed, May 30, 2018 at 01:36:05PM -0700, Guenter Roeck wrote:
> From: Eric Dumazet <edumazet@xxxxxxxxxx>
> 
> 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 before the following patch.
> 
> Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
> Acked-by: Soheil Hassas Yeganeh <soheil@xxxxxxxxxx>
> Acked-by: Wei Wang <weiwan@xxxxxxxxxx>
> Acked-by: Neal Cardwell <ncardwell@xxxxxxxxxx>
> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
> [Backport: sysctl_tcp_rmem is not Namespace-ify'd in older kernels]
> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
> Applies cleanly to v4.4.y and v4.9.y; v4.14.y needs "git am -3".

Now queued up, thanks.

greg k-h



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