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-id = 2635
-title = "A use-after-free bug in pflash_cfi01 snapshot implementation"
-state = "opened"
-created_at = "2024-10-21T14:07:42.031Z"
-closed_at = "n/a"
-labels = []
-url = "https://gitlab.com/qemu-project/qemu/-/issues/2635"
-host-os = "- OS/kernel version:"
-host-arch = "- QEMU flavor:"
-qemu-version = "- QEMU command line:"
-guest-os = "- OS/kernel version:"
-guest-arch = "## Description of problem"
-description = """The flash snapshot restore does not function correctly. Basically when you use “if=pflash,format=raw,unit=0,file=OVMF_VAR.fd", it crashes when trying to restore a snapshot.
-
-The root cause is:
-
-1. In system/runstate.c, function vm_state_notify loops through vm_change_state_head list and calls the callback function for each entry.
-2. One of the callback function pointer points to function postload_update_cb in hw/block/pflash_cfi01.c.
-3. In function postload_update_cb, it calls qemu_del_vm_change_state_handler in which the entry element memory is freed.
-4. Note that, it is still running in the loop, the entry will be visited and get executed, the function pointer may point to a wide memory."""
-reproduce = "n/a"
-additional = """"""