nvme-pci: fix mempool alloc size

Convert the max size to bytes to match the units of the divisor that
calculates the worst-case number of PRP entries.

The result is used to determine how many PRP Lists are required. The
code was previously rounding this to 1 list, but we can require 2 in the
worst case. In that scenario, the driver would corrupt memory beyond the
size provided by the mempool.

While unlikely to occur (you'd need a 4MB in exactly 127 phys segments
on a queue that doesn't support SGLs), this memory corruption has been
observed by kfence.

Cc: Jens Axboe <[email protected]>
Fixes: 943e942e6266f ("nvme-pci: limit max IO size and segments to avoid high order allocations")
Signed-off-by: Keith Busch <[email protected]>
Reviewed-by: Jens Axboe <[email protected]>
Reviewed-by: Kanchan Joshi <[email protected]>
Reviewed-by: Chaitanya Kulkarni <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>

0 files changed, 0 insertions, 0 deletions