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From 311a7eaeef6f90ee1ce063b75673dddfbd392346 Mon Sep 17 00:00:00 2001
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Message-Id: <311a7eaeef6f90ee1ce063b75673dddfbd392346@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Tue, 4 Sep 2018 10:38:48 +0200
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Subject: [PATCH] virDomainDefCompatibleDevice: Relax alias change check
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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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RHEL-7.6: https://bugzilla.redhat.com/show_bug.cgi?id=1621910
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RHEL-8.0: https://bugzilla.redhat.com/show_bug.cgi?id=1603133
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When introducing this check back in 4ad54a417a1 my mindset was
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that if an element is missing in update XML then user is
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requesting for removal of the corresponding setting. For
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instance, if <bandwidth/> is not present in update XML any QoS
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previously set on <interface/> is cleared out. Well this
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assumption is correct but only to some extent.
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Turns out, we have some users who when updating path to ISO
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image construct very minimalistic disk XML and pass it to device
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update API. Such XML is lacking a lot of information, and alias
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is one of them. This triggers error in
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virDomainDefCompatibleDevice() because we think that user is
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requesting to remove the alias. Well, they are not.
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: John Ferlan <jferlan@redhat.com>
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(cherry picked from commit b48d9e939bcf32a8d6e571313637e2eefe52e117)
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/conf/domain_conf.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
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index 8a43e607e9..49b0a59918 100644
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--- a/src/conf/domain_conf.c
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+++ b/src/conf/domain_conf.c
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@@ -28378,9 +28378,9 @@ virDomainDefCompatibleDevice(virDomainDefPtr def,
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if (action == VIR_DOMAIN_DEVICE_ACTION_UPDATE &&
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live &&
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- ((!!data.newInfo != !!data.oldInfo) ||
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- (data.newInfo && data.oldInfo &&
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- STRNEQ_NULLABLE(data.newInfo->alias, data.oldInfo->alias)))) {
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+ (data.newInfo && data.oldInfo &&
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+ data.newInfo->alias && data.oldInfo->alias &&
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+ STRNEQ(data.newInfo->alias, data.oldInfo->alias))) {
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virReportError(VIR_ERR_OPERATION_DENIED, "%s",
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_("changing device alias is not allowed"));
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return -1;
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--
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2.18.0
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