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The bounce buffer for an unaligned descriptor was allocated in execute_async and leaked on error paths, even though, for the sync case the kernel already had a pointer to the buffer. Clean this up by moving ownership of the buffer to the AlignedOperation type. To make it actually safe, stop stashing a guest memory pointer for the duration of the op. Instead, save the guest address and pass guest memory back to the complete function. Signed-off-by: Dylan Reid <dgreid@fb.com>