From 9f774b2a9576d0592a1faf5cbdcbfa31f34746d4 Mon Sep 17 00:00:00 2001 From: Prabhath Sajeepa Date: Mon, 9 Mar 2020 15:07:53 -0600 Subject: [PATCH] nvme-rdma: Avoid double freeing of async event data The timeout of identify cmd, which is invoked as part of admin queue creation, can result in freeing of async event data both in nvme_rdma_timeout handler and error handling path of nvme_rdma_configure_admin queue thus causing NULL pointer reference. Call Trace: ? nvme_rdma_setup_ctrl+0x223/0x800 [nvme_rdma] nvme_rdma_create_ctrl+0x2ba/0x3f7 [nvme_rdma] nvmf_dev_write+0xa54/0xcc6 [nvme_fabrics] __vfs_write+0x1b/0x40 vfs_write+0xb2/0x1b0 ksys_write+0x61/0xd0 __x64_sys_write+0x1a/0x20 do_syscall_64+0x60/0x1e0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reviewed-by: Roland Dreier Reviewed-by: Max Gurtovoy Reviewed-by: Christoph Hellwig Signed-off-by: Prabhath Sajeepa Signed-off-by: Keith Busch --- drivers/nvme/host/rdma.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 3e85c5cacefd2..0fe08c4dfd2f1 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -850,9 +850,11 @@ out_free_tagset: if (new) blk_mq_free_tag_set(ctrl->ctrl.admin_tagset); out_free_async_qe: - nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe, - sizeof(struct nvme_command), DMA_TO_DEVICE); - ctrl->async_event_sqe.data = NULL; + if (ctrl->async_event_sqe.data) { + nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe, + sizeof(struct nvme_command), DMA_TO_DEVICE); + ctrl->async_event_sqe.data = NULL; + } out_free_queue: nvme_rdma_free_queue(&ctrl->queues[0]); return error; -- 2.39.5