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48 lines
2.1 KiB
48 lines
2.1 KiB
From 744a5361793546bed7976acebed669b1928e8c9d Mon Sep 17 00:00:00 2001
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Message-ID: <744a5361793546bed7976acebed669b1928e8c9d.1769699749.git.jdenemar@redhat.com>
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From: Peter Krempa <pkrempa@redhat.com>
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Date: Fri, 23 Jan 2026 08:42:50 +0100
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Subject: [PATCH] qemuSnapshotDiskHasBackingDisk: Avoid call of
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virStorageSourceIsSameLocation with NULL argument
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When the 'backingStore' pointer is not populated the function calls
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'virStorageSourceGetMetadata' to try to populate it but if the on-disk
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metadata doesn't have a backing image (e.g. if it's the 'base' image of
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the chain) the 'backingStore' or the metadata fetcher fails the pointer
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will still be NULL.
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The function then calls 'virStorageSourceIsSameLocation' but the
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internal functions for dealing with storage sources don't handle NULL
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gracefully.
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Since the code calling 'qemu-img' based on the data detected here
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doesn't actually raise errors if the operations fail there's no point
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in raising errors here either.
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Closes: https://gitlab.com/libvirt/libvirt/-/issues/844
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Signed-off-by: Peter Krempa <pkrempa@redhat.com>
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Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
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(cherry picked from commit b43aee9cc904961e0f18156c3c84a3e460bdb7be)
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https://issues.redhat.com/browse/RHEL-144089 [rhel-10.2]
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https://issues.redhat.com/browse/RHEL-144090 [rhel-9.8]
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---
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src/qemu/qemu_snapshot.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
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index 302775af92..dfc3f449e3 100644
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--- a/src/qemu/qemu_snapshot.c
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+++ b/src/qemu/qemu_snapshot.c
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@@ -3135,7 +3135,8 @@ qemuSnapshotDiskHasBackingDisk(void *payload,
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if (!disk->src->backingStore)
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ignore_value(virStorageSourceGetMetadata(disk->src, uid, gid, 1, false));
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- if (virStorageSourceIsSameLocation(disk->src->backingStore, iterdata->diskSrc)) {
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+ if (disk->src->backingStore &&
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+ virStorageSourceIsSameLocation(disk->src->backingStore, iterdata->diskSrc)) {
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struct _qemuSnapshotDisksWithBackingStoreData *data =
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g_new0(struct _qemuSnapshotDisksWithBackingStoreData, 1);
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--
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2.52.0
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