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drm: udl: Properly check framebuffer mmap offsets

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commit 3b82a4db8e upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman
2018-03-21 16:45:53 +01:00
parent fc1142a8ca
commit c8deec7181
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;