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cpu-exec: fix icount out-of-bounds access
When icount is active, tb_add_jump is surprisingly called with an out of bounds basic block index. I have no idea how that can work, but it does not seem like a good idea. Clear *last_tb for all TB_EXIT_ICOUNT_EXPIRED cases, even when all you have to do is refill icount_extra. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> (cherry picked from commit 43d70dd) Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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