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SubjectRe: [PATCH] udp: fix integer overflow while computing available space in sk_rcvbuf
From: Antonio Messina <>
Date: Thu, 19 Dec 2019 15:08:03 +0100

> When the size of the receive buffer for a socket is close to 2^31 when
> computing if we have enough space in the buffer to copy a packet from
> the queue to the buffer we might hit an integer overflow.
> When an user set net.core.rmem_default to a value close to 2^31 UDP
> packets are dropped because of this overflow. This can be visible, for
> instance, with failure to resolve hostnames.
> This can be fixed by casting sk_rcvbuf (which is an int) to unsigned
> int, similarly to how it is done in TCP.
> Signed-off-by: Antonio Messina <>

Applied and queued up for -stable, thanks.

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