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virtio-mmio: fix memory leak of vm_dev

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With the recent removal of vm_dev from devres its memory is only freed
via the callback virtio_mmio_release_dev. However, this only takes
effect after device_add is called by register_virtio_device. Until then
it's an unmanaged resource and must be explicitly freed on error exit.

This bug was discovered and resolved using Coverity Static Analysis
Security Testing (SAST) by Synopsys, Inc.

Cc: stable@vger.kernel.org
Fixes: 55c91fedd0 ("virtio-mmio: don't break lifecycle of vm_dev")
Signed-off-by: Maximilian Heyne <mheyne@amazon.de>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>

Message-Id: <20230911090328.40538-1-mheyne@amazon.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Maximilian Heyne 2023-09-11 09:03:29 +00:00 committed by Michael S. Tsirkin
parent d121df789b
commit fab7f25922
1 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/virtio/virtio_mmio.c
View File

@ -631,14 +631,17 @@ static int virtio_mmio_probe(struct platform_device *pdev)
spin_lock_init(&vm_dev->lock);
vm_dev->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(vm_dev->base))
return PTR_ERR(vm_dev->base);
if (IS_ERR(vm_dev->base)) {
rc = PTR_ERR(vm_dev->base);
goto free_vm_dev;
}
/* Check magic value */
magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE);
if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) {
dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic);
return -ENODEV;
rc = -ENODEV;
goto free_vm_dev;
}
/* Check device version */
@ -646,7 +649,8 @@ static int virtio_mmio_probe(struct platform_device *pdev)
if (vm_dev->version < 1 || vm_dev->version > 2) {
dev_err(&pdev->dev, "Version %ld not supported!\n",
vm_dev->version);
return -ENXIO;
rc = -ENXIO;
goto free_vm_dev;
}
vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID);
@ -655,7 +659,8 @@ static int virtio_mmio_probe(struct platform_device *pdev)
* virtio-mmio device with an ID 0 is a (dummy) placeholder
* with no function. End probing now with no error reported.
*/
return -ENODEV;
rc = -ENODEV;
goto free_vm_dev;
}
vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID);
@ -685,6 +690,10 @@ static int virtio_mmio_probe(struct platform_device *pdev)
put_device(&vm_dev->vdev.dev);
return rc;
free_vm_dev:
kfree(vm_dev);
return rc;
}
static int virtio_mmio_remove(struct platform_device *pdev)