[PATCH 5.5 07/46] nvme-rdma: Avoid double freeing of async event data - Greg Kroah-Hartman

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Roland Dreier <roland@purestorage.com>,
	Max Gurtovoy <maxg@mellanox.com>, Christoph Hellwig <hch@lst.de>,
	Prabhath Sajeepa <psajeepa@purestorage.com>,
	Keith Busch <kbusch@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.5 07/46] nvme-rdma: Avoid double freeing of async event data
Date: Tue,  7 Apr 2020 12:21:38 +0200	[thread overview]
Message-ID: <20200407101500.273308750@linuxfoundation.org> (raw)
In-Reply-To: <20200407101459.502593074@linuxfoundation.org>

From: Prabhath Sajeepa <psajeepa@purestorage.com>

[ Upstream commit 9134ae2a2546cb96abddcd4469a79c77ee3a4480 ]

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 <roland@purestorage.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Prabhath Sajeepa <psajeepa@purestorage.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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;
-- 
2.20.1



