mptcp: fix lockless access in subflow ULP diag

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commit b8adb69a7d upstream.

Since the introduction of the subflow ULP diag interface, the
dump callback accessed all the subflow data with lockless.

We need either to annotate all the read and write operation accordingly,
or acquire the subflow socket lock. Let's do latter, even if slower, to
avoid a diffstat havoc.

Fixes: 5147dfb508 ("mptcp: allow dumping subflow context to userspace")
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Paolo Abeni 2024-02-15 19:25:30 +01:00 • committed by Greg Kroah-Hartman

parent 9e8e59af3a

commit 71787c665d

3 changed files with 7 additions and 3 deletions

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2

include/net/tcp.h

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6

net/mptcp/diag.c

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2

net/tls/tls_main.c

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