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Date:   Wed, 09 Nov 2016 13:18:45 -0500 (EST)
From:   David Miller <>
Subject: Re: [PATCH net] sock: fix sendmmsg for partial sendmsg

From: Soheil Hassas Yeganeh <>
Date: Fri,  4 Nov 2016 15:36:49 -0400

> From: Soheil Hassas Yeganeh <>
> Do not send the next message in sendmmsg for partial sendmsg
> invocations.
> sendmmsg assumes that it can continue sending the next message
> when the return value of the individual sendmsg invocations
> is positive. It results in corrupting the data for TCP,
> SCTP, and UNIX streams.
> For example, sendmmsg([["abcd"], ["efgh"]]) can result in a stream
> of "aefgh" if the first sendmsg invocation sends only the first
> byte while the second sendmsg goes through.
> Datagram sockets either send the entire datagram or fail, so
> this patch affects only sockets of type SOCK_STREAM and
> Fixes: 228e548e6020 ("net: Add sendmmsg socket system call")
> Signed-off-by: Soheil Hassas Yeganeh <>
> Signed-off-by: Eric Dumazet <>
> Signed-off-by: Willem de Bruijn <>
> Signed-off-by: Neal Cardwell <>

Applied and queued up for -stable, thanks.

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