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From: "Min Hu (Connor)" <humin29@huawei.com>
To: <dev@dpdk.org>
Cc: Huisong Li <lihuisong@huawei.com>, <stable@dpdk.org>,
	Min Hu <humin29@huawei.com>,
	Gaetan Rivet <gaetan.rivet@6wind.com>
Subject: [PATCH 1/2] bus/pci: fix a segfault when call callback
Date: Sat, 21 May 2022 15:05:22 +0800	[thread overview]
Message-ID: <20220521070523.34983-2-humin29@huawei.com> (raw)
In-Reply-To: <20220521070523.34983-1-humin29@huawei.com>

From: Huisong Li <lihuisong@huawei.com>

After the driver probe is executed, the callback in application will
be called. The callback in application may call some APIs which access the
rte_pci_driver::driver by the device::driver pointer to get driver
information. If the rte_pci_device::device::driver pointer isn't pointed to
rte_pci_driver::driver in rte_pci_probe_one_driver, a segfault will occur.
For example, when ethdev driver probe completes, the callback in
application call rte_eth_dev_info_get which use dev->device->driver->name.
So rte_pci_device::device::driver should point to rte_pci_driver::driver
before executing the driver probe.

Fixes: c752998b5e2e ("pci: introduce library and driver")
Cc: stable@dpdk.org

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
---
 drivers/bus/pci/pci_common.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/pci/pci_common.c b/drivers/bus/pci/pci_common.c
index 4a3a87f24f..507a654779 100644
--- a/drivers/bus/pci/pci_common.c
+++ b/drivers/bus/pci/pci_common.c
@@ -265,11 +265,22 @@ rte_pci_probe_one_driver(struct rte_pci_driver *dr,
 			dr->driver.name, dev->id.vendor_id, dev->id.device_id,
 			loc->domain, loc->bus, loc->devid, loc->function,
 			dev->device.numa_node);
+
+	/*
+	 * After the driver probe is executed, the callback in application will
+	 * be called. The callback in application may call some APIs which use
+	 * dev->device.driver to get some driver information. If the driver
+	 * pointer isn't pointed to driver->driver here, a segfault will occur.
+	 */
+	if (!already_probed)
+		dev->device.driver = &dr->driver;
+
 	/* call the driver probe() function */
 	ret = dr->probe(dr, dev);
 	if (already_probed)
 		return ret; /* no rollback if already succeeded earlier */
 	if (ret) {
+		dev->device.driver = NULL;
 		dev->driver = NULL;
 		if ((dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING) &&
 			/* Don't unmap if device is unsupported and
@@ -282,8 +293,6 @@ rte_pci_probe_one_driver(struct rte_pci_driver *dr,
 		dev->vfio_req_intr_handle = NULL;
 		rte_intr_instance_free(dev->intr_handle);
 		dev->intr_handle = NULL;
-	} else {
-		dev->device.driver = &dr->driver;
 	}
 
 	return ret;
-- 
2.33.0


  reply	other threads:[~2022-05-21  7:06 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-21  7:05 [PATCH 0/2] " Min Hu (Connor)
2022-05-21  7:05 ` Min Hu (Connor) [this message]
2022-06-07 17:38   ` [PATCH 1/2] bus/pci: " Thomas Monjalon
2022-05-21  7:05 ` [PATCH 2/2] bus/vdev: " Min Hu (Connor)

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