4.9-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit d7dcdf9d4e15189ecfda24cc87339a3425448d5c ]
nvmet_rdma_release_rsp() may free the response before using it at error flow.
Fixes: 8407879 ("nvmet-rdma: fix possible bogus dereference under heavy load") Signed-off-by: Israel Rukshin israelr@mellanox.com Reviewed-by: Sagi Grimberg sagi@grimberg.me Reviewed-by: Max Gurtovoy maxg@mellanox.com Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/target/rdma.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c index 2dfd877974d7..486393fa4f3e 100644 --- a/drivers/nvme/target/rdma.c +++ b/drivers/nvme/target/rdma.c @@ -524,6 +524,7 @@ static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc) { struct nvmet_rdma_rsp *rsp = container_of(wc->wr_cqe, struct nvmet_rdma_rsp, send_cqe); + struct nvmet_rdma_queue *queue = cq->cq_context;
nvmet_rdma_release_rsp(rsp);
@@ -531,7 +532,7 @@ static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc) wc->status != IB_WC_WR_FLUSH_ERR)) { pr_err("SEND for CQE 0x%p failed with status %s (%d).\n", wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status); - nvmet_rdma_error_comp(rsp->queue); + nvmet_rdma_error_comp(queue); } }