vm: fix callframe double free on unhanded exceptions

When invoking a native function as toplevel VM call which indirectly
triggers an unhandled exception in managed code, the callframes are
completely reset before the C function returns, leading to invalid
memory accesses when `uc_vm_call_native()` subsequently popped it's
own callframe again.

This issue did not surface by executing script code through the
interpreter since in this case the VM will always execute a managed
code as toplevel call, but it could be triggered by invoking a native
function triggering an exception through the C API using `uc_vm_call()`
on a fresh `uc_vm_t` context or by utilizing the CLI interpreters `-l`
flag to preload a native code library triggering an exception.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

0 files changed, 0 insertions, 0 deletions