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samples: vfio-mdev: fix error handing in mdpy_fb_probe()

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[ Upstream commit 752774ce7793a1f8baa55aae31f3b4caac49cbe4 ]

Fix to return a negative error code from the framebuffer_alloc() error
handling case instead of 0, also release regions in some error handing
cases.

Fixes: cacade1946 ("sample: vfio mdev display - guest driver")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Message-Id: <20210520133641.1421378-1-weiyongjun1@huawei.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wei Yongjun 2021-05-20 13:36:41 +00:00 committed by Greg Kroah-Hartman
parent c25454a4f4
commit 2adb0313b1
1 changed files with 9 additions and 4 deletions
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13
samples/vfio-mdev/mdpy-fb.c
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@ -117,22 +117,27 @@ static int mdpy_fb_probe(struct pci_dev *pdev,
if (format != DRM_FORMAT_XRGB8888) { if (format != DRM_FORMAT_XRGB8888) {
pci_err(pdev, "format mismatch (0x%x != 0x%x)\n", pci_err(pdev, "format mismatch (0x%x != 0x%x)\n",
format, DRM_FORMAT_XRGB8888); format, DRM_FORMAT_XRGB8888);
return -EINVAL; ret = -EINVAL;
goto err_release_regions;
} }
if (width < 100 || width > 10000) { if (width < 100 || width > 10000) {
pci_err(pdev, "width (%d) out of range\n", width); pci_err(pdev, "width (%d) out of range\n", width);
return -EINVAL; ret = -EINVAL;
goto err_release_regions;
} }
if (height < 100 || height > 10000) { if (height < 100 || height > 10000) {
pci_err(pdev, "height (%d) out of range\n", height); pci_err(pdev, "height (%d) out of range\n", height);
return -EINVAL; ret = -EINVAL;
goto err_release_regions;
} }
pci_info(pdev, "mdpy found: %dx%d framebuffer\n", pci_info(pdev, "mdpy found: %dx%d framebuffer\n",
width, height); width, height);
info = framebuffer_alloc(sizeof(struct mdpy_fb_par), &pdev->dev); info = framebuffer_alloc(sizeof(struct mdpy_fb_par), &pdev->dev);
if (!info) if (!info) {
ret = -ENOMEM;
goto err_release_regions; goto err_release_regions;
}
pci_set_drvdata(pdev, info); pci_set_drvdata(pdev, info);
par = info->par; par = info->par;