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io_uring: fix leaving invalid req->flags 

sqe->flags are subset of req flags, so incorrectly copied may span into
in-kernel flags and wreck havoc, e.g. by setting REQ_F_INFLIGHT.

Fixes: 5be9ad1e42 ("io_uring: optimise io_init_req() flags setting")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-02-20 01:39:53 +00:00 committed by Jens Axboe
parent 88f171ab77
commit ebf4a5db69
1 changed files with 3 additions and 1 deletions
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4
fs/io_uring.c
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@ -6679,8 +6679,10 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
req->result = 0;
/* enforce forwards compatibility on users */
if (unlikely(sqe_flags & ~SQE_VALID_FLAGS))
if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) {
req->flags = 0;
return -EINVAL;
}
if (unlikely(req->opcode >= IORING_OP_LAST))
return -EINVAL;