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e66f8f32f5
There's a race between rxrpc_recvmsg() and rxrpc_notify_socket(), whereby
the latter's attempt to avoid disabling interrupts and taking the socket's
recvmsg_lock if the call is already queued may happen simultaneously with
the former's discarding of a call that has nothing queued.
Fix this by removing the shortcut. Note that this only affects userspace's
use of AF_RXRPC; the AFS filesystem driver doesn't use the socket queue.
Fixes: 248f219cb8 ("rxrpc: Rewrite the data and ack handling code")
Link: https://sashiko.dev/#/patchset/20260616155749.2125907-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Jeffrey Altman <jaltman@auristor.com>
cc: Simon Horman <horms@kernel.org>
cc: linux-afs@lists.infradead.org
cc: stable@kernel.org
Link: https://patch.msgid.link/20260624163819.3017002-10-dhowells@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>