[pull] v1.x from libuv:v1.x #92
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If uv_spawn() fails after uv__handle_init() has been called, the handle remains in loop->handle_queue. This causes use-after-free if the handle is stack-allocated or freed, and a subsequent loop operation like uv_walk() accesses it. This follows the same pattern as uv_tcp_init_ex() which explicitly removes the handle from the queue on error.
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