Subject: Re: [PATCH] af_unix: fix regression in read after shutdown

From: [email-masked]
Date: Sat, 20 Nov 2021 15:20:08 +0000

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <[email-masked]>:

On Fri, 19 Nov 2021 13:05:21 +0100 you wrote:
> On kernels before v5.15, calling read() on a unix socket after
> shutdown(SHUT_RD) or shutdown(SHUT_RDWR) would return the data
> previously written or EOF.  But now, while read() after
> shutdown(SHUT_RD) still behaves the same way, read() after
> shutdown(SHUT_RDWR) always fails with -EINVAL.
> 
> This behaviour change was apparently inadvertently introduced as part of
> a bug fix for a different regression caused by the commit adding sockmap
> support to af_unix, commit 94531cfcbe79c359 ("af_unix: Add
> unix_stream_proto for sockmap").  Those commits, for unclear reasons,
> started setting the socket state to TCP_CLOSE on shutdown(SHUT_RDWR),
> while this state change had previously only been done in
> unix_release_sock().
> 
> [...]

Here is the summary with links:
  - af_unix: fix regression in read after shutdown
    https://git.kernel.org/netdev/net/c/f9390b249c90

You are awesome, thank you!
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