nvme-tcp: fix possible crash in write_zeroes processing

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We cannot look at blk_rq_payload_bytes without first checking
that the request has a mappable physical segments first (e.g.
blk_rq_nr_phys_segments(rq) != 0) and only then to take the
request payload bytes. This caused us to send a wrong sgl to
the target or even dereference a non-existing buffer in case
we actually got to the data send sequence (if it was in-capsule).

Reported-by: Tony Asleson <tasleson@redhat.com>
Suggested-by: Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>

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Sagi Grimberg 2020-03-23 15:06:30 -07:00 • committed by Christoph Hellwig

parent d038dd815f

commit 25e5cb780e

1 changed files with 7 additions and 6 deletions

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drivers/nvme/host/tcp.c

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