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coroutine: Fix use after free with qemu_coroutine_yield()
Instead of using the same function for entering and exiting coroutines, and hoping that it doesn't add any functionality that hurts with the parameters used for exiting, we can just directly call into the real task switch in qemu_coroutine_switch(). This fixes a use-after-free scenario where reentering a coroutine that has yielded still accesses the old parent coroutine (which may have meanwhile terminated) in the part of coroutine_swap() that follows qemu_coroutine_switch(). Cc: qemu-stable@nongnu.org Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> (cherry picked from commit 80687b4) Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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