soc: aspeed: p2a-ctrl: Fix boundary check for mmap

The check mixes pages (vm_pgoff) with bytes (vm_start, vm_end) on one
side of the comparison, and uses resource address (rather than just the
resource size) on the other side of the comparison.
This can allow malicious userspace to easily bypass the boundary check and
map pages that are located outside memory-region reserved by the driver.

Fixes: 01c60dc ("drivers/misc: Add Aspeed P2A control driver")
Cc: [email protected]
Signed-off-by: Iwona Winiarska <[email protected]>
Reviewed-by: Andrew Jeffery <[email protected]>
Tested-by: Andrew Jeffery <[email protected]>
Reviewed-by: Joel Stanley <[email protected]>
Signed-off-by: Joel Stanley <[email protected]>

Author: iklimasz

drivers/soc/aspeed/aspeed-p2a-ctrl.c

@@ -110,7 +110,7 @@ static int aspeed_p2a_mmap(struct file *file, struct vm_area_struct *vma)
 	vsize = vma->vm_end - vma->vm_start;
 	prot = vma->vm_page_prot;
 
-	if (vma->vm_pgoff + vsize > ctrl->mem_base + ctrl->mem_size)
+	if (vma->vm_pgoff + vma_pages(vma) > ctrl->mem_size >> PAGE_SHIFT)
 		return -EINVAL;
 
 	/* ast2400/2500 AHB accesses are not cache coherent */