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From 3f937c82256585da1abba44c4600b96b0b186df4 Mon Sep 17 00:00:00 2001
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Fri, 6 Jul 2018 17:56:53 +0200
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Subject: [PATCH 193/268] pr-manager-helper: avoid SIGSEGV when writing to the
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socket fail
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <20180706175659.30615-4-pbonzini@redhat.com>
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Patchwork-id: 81245
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O-Subject: [RHEL7.6 qemu-kvm-rhev PATCH 3/9] pr-manager-helper: avoid SIGSEGV when writing to the socket fail
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Bugzilla: 1533158
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Michal Privoznik <mprivozn@redhat.com>
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When writing to the qemu-pr-helper socket failed, the persistent
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reservation manager was correctly disconnecting the socket, but it
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did not clear pr_mgr->ioc. So the rest of the code did not know
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that the socket had been disconnected, accessed pr_mgr->ioc and
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happily caused a crash.
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To reproduce, it is enough to stop qemu-pr-helper between QEMU
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startup and executing e.g. sg_persist -k /dev/sdb.
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Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit aad10040d411d21542dc9ae58a2854c89ccedd78)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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scsi/pr-manager-helper.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/scsi/pr-manager-helper.c b/scsi/pr-manager-helper.c
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index 82ff6b6..0c0fe38 100644
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--- a/scsi/pr-manager-helper.c
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+++ b/scsi/pr-manager-helper.c
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@@ -71,6 +71,7 @@ static int pr_manager_helper_write(PRManagerHelper *pr_mgr,
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if (n_written <= 0) {
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assert(n_written != QIO_CHANNEL_ERR_BLOCK);
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object_unref(OBJECT(pr_mgr->ioc));
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+ pr_mgr->ioc = NULL;
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return n_written < 0 ? -EINVAL : 0;
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}
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--
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1.8.3.1
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