61 lines
1.9 KiB
Diff
61 lines
1.9 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Fabian Ebner <f.ebner@proxmox.com>
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Date: Wed, 25 May 2022 13:59:38 +0200
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Subject: [PATCH] PVE-Backup: ensure jobs in di_list are referenced
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Ensures that qmp_backup_cancel doesn't pick a job that's already been
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freed. With unlucky timings it seems possible that:
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1. job_exit -> job_completed -> job_finalize_single starts
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2. pvebackup_co_complete_stream gets spawned in completion callback
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3. job finalize_single finishes -> job's refcount hits zero -> job is
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freed
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4. qmp_backup_cancel comes in and locks backup_state.backup_mutex
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before pvebackup_co_complete_stream can remove the job from the
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di_list
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5. qmp_backup_cancel will pick a job that's already been freed
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Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
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Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
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---
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pve-backup.c | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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diff --git a/pve-backup.c b/pve-backup.c
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index 5bed6f4014..cd45e66a61 100644
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--- a/pve-backup.c
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+++ b/pve-backup.c
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@@ -316,6 +316,11 @@ static void coroutine_fn pvebackup_co_complete_stream(void *opaque)
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}
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}
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+ if (di->job) {
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+ job_unref(&di->job->job);
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+ di->job = NULL;
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+ }
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+
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// remove self from job list
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backup_state.di_list = g_list_remove(backup_state.di_list, di);
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@@ -494,6 +499,9 @@ static void create_backup_jobs_bh(void *opaque) {
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aio_context_release(aio_context);
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di->job = job;
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+ if (job) {
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+ job_ref(&job->job);
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+ }
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if (!job || local_err) {
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error_setg(errp, "backup_job_create failed: %s",
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@@ -528,6 +536,11 @@ static void create_backup_jobs_bh(void *opaque) {
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aio_context_release(ctx);
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canceled = true;
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}
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+
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+ if (di->job) {
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+ job_unref(&di->job->job);
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+ di->job = NULL;
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+ }
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}
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}
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