linux-kernel - [PATCH] Drivers: hv: vmbus: Add missing check for dma_set_mask in vmbus_device

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Message-Id: <20240701023059.83616-1-make24@iscas.ac.cn>
Date: Mon,  1 Jul 2024 10:30:59 +0800
From: Haoxiang Li <make24@...as.ac.cn>
To: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	parri.andrea@...il.com,
	mikelley@...rosoft.com
Cc: linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Haoxiang Li <make24@...as.ac.cn>
Subject: [PATCH] Drivers: hv: vmbus: Add missing check for dma_set_mask in vmbus_device_register()

child_device_obj->device cannot perform DMA properly if dma_set_mask()
returns non-zero. Add check for dma_set_mask() and return the error if it
fails. child_device_obj->device is not initialized here, so use kfree() to
free child_device_obj->device.

Fixes: 3a5469582c24 ("Drivers: hv: vmbus: Fix initialization of device object in vmbus_device_register()")
Signed-off-by: Haoxiang Li <make24@...as.ac.cn>
---
 drivers/hv/vmbus_drv.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 12a707ab73f8..daa584eaa2af 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1897,7 +1897,13 @@ int vmbus_device_register(struct hv_device *child_device_obj)
 
 	child_device_obj->device.dma_parms = &child_device_obj->dma_parms;
 	child_device_obj->device.dma_mask = &child_device_obj->dma_mask;
-	dma_set_mask(&child_device_obj->device, DMA_BIT_MASK(64));
+	ret = dma_set_mask(&child_device_obj->device, DMA_BIT_MASK(64));
+
+	if (ret) {
+		pr_err("64-bit DMA enable failed\n");
+		kfree(&child_device_obj->device);
+		return ret;
+	}
 
 	/*
 	 * Register with the LDM. This will kick off the driver/device
-- 
2.25.1