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From d0f2fffa7c1a86f56f18143a1a14b9a32f8bcf16 Mon Sep 17 00:00:00 2001
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Message-Id: <d0f2fffa7c1a86f56f18143a1a14b9a32f8bcf16@dist-git>
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From: John Ferlan <jferlan@redhat.com>
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Date: Wed, 16 Jan 2019 15:54:31 -0500
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Subject: [PATCH] qemu: Fix logic error in qemuSetUnprivSGIO
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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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https://bugzilla.redhat.com/show_bug.cgi?id=1666605
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RHEL-only
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Commit c0f26a13c6 had a logic error with using both DISK and
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sgio which resulted in a DISK that didn't have sgio set falling
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into the else clause and trying to deref a NULL @hostdev resulting
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in a libvirtd crash:
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Thread 1 (Thread 0x7ffbc6353700 (LWP 12642)):
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0 0x00007ffb958e7d7a in qemuSetUnprivSGIO
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1 0x00007ffb958d9d92 in qemuDomainAttachDeviceDiskLive
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2 0x00007ffb9594fce8 in qemuDomainAttachDeviceFlags
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3 0x00007ffbde399d71 in virDomainAttachDevice
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4 0x0000563b73ded4b2 in remoteDispatchDomainAttachDeviceHelper
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for hotplug of XML:
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<disk device="lun" type="block">
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<source dev="/dev/sdb"/>
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<driver name="qemu" type="raw"/>
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<target bus="scsi" dev="sdb"/>
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</disk>
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Signed-off-by: John Ferlan <jferlan@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/qemu/qemu_conf.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
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index 5971f3eb64..768e9d8308 100644
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--- a/src/qemu/qemu_conf.c
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+++ b/src/qemu/qemu_conf.c
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@@ -1679,9 +1679,9 @@ qemuSetUnprivSGIO(virDomainDeviceDefPtr dev)
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goto cleanup;
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/* By default, filter the SG_IO commands, i.e. set unpriv_sgio to 0. */
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- if (dev->type == VIR_DOMAIN_DEVICE_DISK &&
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- disk->sgio == VIR_DOMAIN_DEVICE_SGIO_UNFILTERED) {
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- val = 1;
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+ if (dev->type == VIR_DOMAIN_DEVICE_DISK) {
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+ if (disk->sgio == VIR_DOMAIN_DEVICE_SGIO_UNFILTERED)
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+ val = 1;
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} else {
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/* Only settable if <shareable/> was present for hostdev */
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if (qemuIsSharedHostdev(hostdev) &&
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--
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2.20.1
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