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staging: xgifb: prevent video RAM size exceeding PCI window size

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Add a sanity check for the video RAM size. It should fit into the
PCI window.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aaro Koskinen 2012-09-12 00:44:38 +03:00 committed by Greg Kroah-Hartman
parent a09f347c6c
commit 6b2a7e0c9b
1 changed files with 4 additions and 0 deletions
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4
drivers/staging/xgifb/XGI_main_26.c
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@ -1700,6 +1700,7 @@ static int __devinit xgifb_probe(struct pci_dev *pdev,
struct fb_info *fb_info;
struct xgifb_video_info *xgifb_info;
struct xgi_hw_device_info *hw_info;
unsigned long video_size_max;
fb_info = framebuffer_alloc(sizeof(*xgifb_info), &pdev->dev);
if (!fb_info)
@ -1720,6 +1721,7 @@ static int __devinit xgifb_probe(struct pci_dev *pdev,
xgifb_info->subsysvendor = pdev->subsystem_vendor;
xgifb_info->subsysdevice = pdev->subsystem_device;
video_size_max = pci_resource_len(pdev, 0);
xgifb_info->video_base = pci_resource_start(pdev, 0);
xgifb_info->mmio_base = pci_resource_start(pdev, 1);
xgifb_info->mmio_size = pci_resource_len(pdev, 1);
@ -1780,6 +1782,8 @@ static int __devinit xgifb_probe(struct pci_dev *pdev,
"Fatal error: Unable to determine RAM size.\n");
ret = -ENODEV;
goto error_disable;
} else if (xgifb_info->video_size > video_size_max) {
xgifb_info->video_size = video_size_max;
}
/* Enable PCI_LINEAR_ADDRESSING and MMIO_ENABLE */