io_uring/kbuf: check for buffer list readiness after NULL check
[ Upstream commit 9865346b ] Move the buffer list 'is_ready' check below the validity check for the buffer list for a given group. Fixes: 5cf4f52e ("io_uring: free io_buffer_list entries via RCU") Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>
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