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io_uring: ensure registered buffer import returns the IO length

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A test case was reported where two linked reads with registered buffers
failed the second link always. This is because we set the expected value
of a request in req->result, and if we don't get this result, then we
fail the dependent links. For some reason the registered buffer import
returned -ERROR/0, while the normal import returns -ERROR/length. This
broke linked commands with registered buffers.

Fix this by making io_import_fixed() correctly return the mapped length.

Cc: stable@vger.kernel.org # v5.3
Reported-by: 李通洲 <carter.li@eoitek.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-11-13 16:12:46 -07:00
parent 5683e5406e
commit 5e559561a8
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -1230,7 +1230,7 @@ static int io_import_fixed(struct io_ring_ctx *ctx, int rw,
}
}
return 0;
return len;
}
static ssize_t io_import_iovec(struct io_ring_ctx *ctx, int rw,