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From d706e465682307df95a723e1a74b32c0db93e259 Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Fri, 22 Mar 2019 03:22:30 +0100
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Subject: [PATCH 063/163] nbd/server: Ignore write errors when replying to
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NBD_OPT_ABORT
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20190322032241.8111-18-jsnow@redhat.com>
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Patchwork-id: 85105
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O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 17/28] nbd/server: Ignore write errors when replying to NBD_OPT_ABORT
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Bugzilla: 1691563
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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From: Eric Blake <eblake@redhat.com>
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Commit 37ec36f6 intentionally ignores errors when trying to reply
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to an NBD_OPT_ABORT request for plaintext clients, but did not make
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the same change for a TLS server. Since NBD_OPT_ABORT is
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documented as being a potential for an EPIPE when the client hangs
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up without waiting for our reply, we don't need to pollute the
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server's output with that failure.
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Signed-off-by: Eric Blake <eblake@redhat.com>
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Message-Id: <20181117223221.2198751-1-eblake@redhat.com>
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Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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(cherry picked from commit 3e99ebb9d3df15ce0ecf1b435816c9c46ee9a1ad)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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nbd/server.c | 12 ++++++++----
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1 file changed, 8 insertions(+), 4 deletions(-)
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diff --git a/nbd/server.c b/nbd/server.c
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index 418b1d4..e8fd6b4 100644
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--- a/nbd/server.c
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+++ b/nbd/server.c
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@@ -1134,12 +1134,16 @@ static int nbd_negotiate_options(NBDClient *client, uint16_t myflags,
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return -EINVAL;
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default:
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- ret = nbd_opt_drop(client, NBD_REP_ERR_TLS_REQD, errp,
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+ /* Let the client keep trying, unless they asked to
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+ * quit. Always try to give an error back to the
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+ * client; but when replying to OPT_ABORT, be aware
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+ * that the client may hang up before receiving the
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+ * error, in which case we are fine ignoring the
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+ * resulting EPIPE. */
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+ ret = nbd_opt_drop(client, NBD_REP_ERR_TLS_REQD,
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+ option == NBD_OPT_ABORT ? NULL : errp,
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"Option 0x%" PRIx32
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" not permitted before TLS", option);
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- /* Let the client keep trying, unless they asked to
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- * quit. In this mode, we've already sent an error, so
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- * we can't ack the abort. */
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if (option == NBD_OPT_ABORT) {
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return 1;
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}
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--
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1.8.3.1
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