From 02a8ee2e1840d13db065f418969bcfcb404a94cb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Mon, 14 Feb 2022 15:59:17 +0400
Subject: [PATCH] ui/clipboard: fix use-after-free regression
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The same info may be used to update the clipboard, and may be freed
before being ref'ed again.
Fixes: 70a54b01693ed ("ui: avoid compiler warnings from unused clipboard info variable")
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20220214115917.1679568-1-marcandre.lureau@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
ui/clipboard.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/ui/clipboard.c b/ui/clipboard.c
index 5f15cf853d0..9079ef829b5 100644
--- a/ui/clipboard.c
+++ b/ui/clipboard.c
@@ -66,8 +66,10 @@ void qemu_clipboard_update(QemuClipboardInfo *info)
notifier_list_notify(&clipboard_notifiers, ¬ify);
- qemu_clipboard_info_unref(cbinfo[info->selection]);
- cbinfo[info->selection] = qemu_clipboard_info_ref(info);
+ if (cbinfo[info->selection] != info) {
+ qemu_clipboard_info_unref(cbinfo[info->selection]);
+ cbinfo[info->selection] = qemu_clipboard_info_ref(info);
+ }
}
QemuClipboardInfo *qemu_clipboard_info(QemuClipboardSelection selection)
--
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