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io_uring: fix no lock protection for ctx->cq_extra
[ Upstream commit e302f10 ] ctx->cq_extra should be protected by completion lock so that the req_need_defer() does the right check. Cc: stable@vger.kernel.org Signed-off-by: Hao Xu <haoxu@linux.alibaba.com> Link: https://lore.kernel.org/r/20211125092103.224502-2-haoxu@linux.alibaba.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>
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