nvmet: avoid potential UAF in nvmet_req_complete()

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[ Upstream commit 6173a77b7e ]

An nvme target ->queue_response() operation implementation may free the
request passed as argument. Such implementation potentially could result
in a use after free of the request pointer when percpu_ref_put() is
called in nvmet_req_complete().

Avoid such problem by using a local variable to save the sq pointer
before calling __nvmet_req_complete(), thus avoiding dereferencing the
req pointer after that function call.

Fixes: a07b4970f4 ("nvmet: add a generic NVMe target")
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Damien Le Moal 2023-03-06 10:13:13 +09:00 • committed by Greg Kroah-Hartman

parent afd94e7cba

commit bcd535f07c

1 changed files with 3 additions and 1 deletions

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drivers/nvme/target/core.c

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