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driver: char: rpivid: Don't map more than wanted

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Limit mappings to the permitted range, but don't map more than asked
for otherwise we walk off the end of the allocated VMA.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
This commit is contained in:
Phil Elwell
2020-04-21 11:30:23 +01:00
committed by Dom Cobley
parent e43a151cde
commit 87d8106f26
1 changed files with 6 additions and 6 deletions
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10
drivers/char/broadcom/rpivid-mem.c
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@@ -100,6 +100,7 @@ static int rpivid_mem_mmap(struct file *file, struct vm_area_struct *vma)
{
struct rpivid_mem_priv *priv;
unsigned long pages;
unsigned long len;
priv = file->private_data;
pages = priv->regs_phys >> PAGE_SHIFT;
@@ -107,13 +108,12 @@ static int rpivid_mem_mmap(struct file *file, struct vm_area_struct *vma)
* The address decode is far larger than the actual number of registers.
* Just map the whole lot in.
*/
vma->vm_page_prot = phys_mem_access_prot(file, pages,
priv->mem_window_len,
len = min(vma->vm_end - vma->vm_start, priv->mem_window_len);
vma->vm_page_prot = phys_mem_access_prot(file, pages, len,
vma->vm_page_prot);
vma->vm_ops = &rpivid_mem_vm_ops;
if (remap_pfn_range(vma, vma->vm_start,
pages,
priv->mem_window_len,
pages, len,
vma->vm_page_prot)) {
return -EAGAIN;
}
@@ -156,7 +156,7 @@ static int rpivid_mem_probe(struct platform_device *pdev)
ioresource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (ioresource) {
priv->regs_phys = ioresource->start;
priv->mem_window_len = ioresource->end - ioresource->start;
priv->mem_window_len = (ioresource->end + 1) - ioresource->start;
} else {
dev_err(priv->dev, "failed to get IO resource");
err = -ENOENT;