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From: Fiona Ebner <f.ebner@proxmox.com>
To: pve-devel@lists.proxmox.com
Date: Fri, 14 Jun 2024 13:00:42 +0200
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Subject: [pve-devel] [PATCH v2 qemu] fix #4726: avoid superfluous check in
vma code
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The 'status' pointer is dereferenced regardless of the NULL check,
i.e. 'status->closed' is accessed after the branch with the check.
Since all callers pass in the address of a struct on the stack, the
pointer can never be NULL. Remove the superfluous check and add an
assert instead.
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---
Changes in v2:
* Clarify wording in commit message.
...VE-Backup-add-vma-backup-format-code.patch | 23 +++++++++----------
1 file changed, 11 insertions(+), 12 deletions(-)
diff --git a/debian/patches/pve/0027-PVE-Backup-add-vma-backup-format-code.patch b/debian/patches/pve/0027-PVE-Backup-add-vma-backup-format-code.patch
index ee40ab8..d6d7767 100644
--- a/debian/patches/pve/0027-PVE-Backup-add-vma-backup-format-code.patch
+++ b/debian/patches/pve/0027-PVE-Backup-add-vma-backup-format-code.patch
@@ -16,10 +16,10 @@ Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
block/meson.build | 2 +
meson.build | 5 +
vma-reader.c | 870 ++++++++++++++++++++++++++++++++++++++++++++
- vma-writer.c | 818 +++++++++++++++++++++++++++++++++++++++++
+ vma-writer.c | 817 +++++++++++++++++++++++++++++++++++++++++
vma.c | 901 ++++++++++++++++++++++++++++++++++++++++++++++
vma.h | 150 ++++++++
- 6 files changed, 2746 insertions(+)
+ 6 files changed, 2745 insertions(+)
create mode 100644 vma-reader.c
create mode 100644 vma-writer.c
create mode 100644 vma.c
@@ -939,10 +939,10 @@ index 0000000000..d0b6721812
+
diff --git a/vma-writer.c b/vma-writer.c
new file mode 100644
-index 0000000000..126b296647
+index 0000000000..a466652a5d
--- /dev/null
+++ b/vma-writer.c
-@@ -0,0 +1,818 @@
+@@ -0,0 +1,817 @@
+/*
+ * VMA: Virtual Machine Archive
+ *
@@ -1517,17 +1517,16 @@ index 0000000000..126b296647
+ int i;
+
+ g_assert(vmaw != NULL);
++ g_assert(status != NULL);
+
-+ if (status) {
-+ status->status = vmaw->status;
-+ g_strlcpy(status->errmsg, vmaw->errmsg, sizeof(status->errmsg));
-+ for (i = 0; i <= 255; i++) {
-+ status->stream_info[i] = vmaw->stream_info[i];
-+ }
-+
-+ uuid_unparse_lower(vmaw->uuid, status->uuid_str);
++ status->status = vmaw->status;
++ g_strlcpy(status->errmsg, vmaw->errmsg, sizeof(status->errmsg));
++ for (i = 0; i <= 255; i++) {
++ status->stream_info[i] = vmaw->stream_info[i];
+ }
+
++ uuid_unparse_lower(vmaw->uuid, status->uuid_str);
++
+ status->closed = vmaw->closed;
+
+ return vmaw->status;
--
2.39.2
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