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drm: udl: Properly check framebuffer mmap offsets 

The memmap options sent to the udl framebuffer driver were not being
checked for all sets of possible crazy values.  Fix this up by properly
bounding the allowed values.

Reported-by: Eyal Itkin <eyalit@checkpoint.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180321154553.GA18454@kroah.com
This commit is contained in:
Greg Kroah-Hartman 2018-03-21 16:45:53 +01:00 committed by Daniel Vetter
parent b24791fe00
commit 3b82a4db8e
1 changed files with 7 additions and 2 deletions
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9
drivers/gpu/drm/udl/udl_fb.c
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@ -159,10 +159,15 @@ static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
unsigned long start = vma->vm_start;
unsigned long size = vma->vm_end - vma->vm_start;
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
unsigned long offset;
unsigned long page, pos;
if (offset + size > info->fix.smem_len)
if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
return -EINVAL;
offset = vma->vm_pgoff << PAGE_SHIFT;
if (offset > info->fix.smem_len || size > info->fix.smem_len - offset)
return -EINVAL;
pos = (unsigned long)info->fix.smem_start + offset;