From eec80321b1066ea326746fb70e99575e5d2f2954 Mon Sep 17 00:00:00 2001
Message-Id: <eec80321b1066ea326746fb70e99575e5d2f2954@dist-git>
From: John Ferlan <jferlan@redhat.com>
Date: Tue, 29 Jan 2019 19:01:50 -0500
Subject: [PATCH] qemu: Fix logic error in qemuSetUnprivSGIO
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https://bugzilla.redhat.com/show_bug.cgi?id=1669581 (RHEL7)
https://bugzilla.redhat.com/show_bug.cgi?id=1666605 (RHEL8)
RHEL-only
Commit 8b246c4bb had a logic error with using both DISK and
sgio which resulted in a DISK that didn't have sgio set falling
into the else clause and trying to deref a NULL @hostdev resulting
in a libvirtd crash:
Thread 1 (Thread 0x7ffbc6353700 (LWP 12642)):
0 0x00007ffb958e7d7a in qemuSetUnprivSGIO
1 0x00007ffb958d9d92 in qemuDomainAttachDeviceDiskLive
2 0x00007ffb9594fce8 in qemuDomainAttachDeviceFlags
3 0x00007ffbde399d71 in virDomainAttachDevice
4 0x0000563b73ded4b2 in remoteDispatchDomainAttachDeviceHelper
for hotplug of XML:
<disk device="lun" type="block">
<source dev="/dev/sdb"/>
<driver name="qemu" type="raw"/>
<target bus="scsi" dev="sdb"/>
</disk>
Signed-off-by: John Ferlan <jferlan@redhat.com>
Message-Id: <20190130000151.4479-3-jferlan@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
---
src/qemu/qemu_conf.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index 5971f3eb64..768e9d8308 100644
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -1679,9 +1679,9 @@ qemuSetUnprivSGIO(virDomainDeviceDefPtr dev)
goto cleanup;
/* By default, filter the SG_IO commands, i.e. set unpriv_sgio to 0. */
- if (dev->type == VIR_DOMAIN_DEVICE_DISK &&
- disk->sgio == VIR_DOMAIN_DEVICE_SGIO_UNFILTERED) {
- val = 1;
+ if (dev->type == VIR_DOMAIN_DEVICE_DISK) {
+ if (disk->sgio == VIR_DOMAIN_DEVICE_SGIO_UNFILTERED)
+ val = 1;
} else {
/* Only settable if <shareable/> was present for hostdev */
if (qemuIsSharedHostdev(hostdev) &&
--
2.21.0