From: Damien Le Moal damien.lemoal@opensource.wdc.com
[ Upstream commit 6173a77b7e9d3e202bdb9897b23f2a8afe7bf286 ]
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: a07b4970f464 ("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 --- drivers/nvme/target/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index cfd0385511564..4c6d56dd29adc 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -756,8 +756,10 @@ static void __nvmet_req_complete(struct nvmet_req *req, u16 status)
void nvmet_req_complete(struct nvmet_req *req, u16 status) { + struct nvmet_sq *sq = req->sq; + __nvmet_req_complete(req, status); - percpu_ref_put(&req->sq->ref); + percpu_ref_put(&sq->ref); } EXPORT_SYMBOL_GPL(nvmet_req_complete);