CVE-2022-50221

In the Linux kernel, the following vulnerability has been resolved:

drm/fb-helper: Fix out-of-bounds access

Clip memory range to screen-buffer size to avoid out-of-bounds access

in fbdev deferred I/O's damage handling.

Fbdev's deferred I/O can only track pages. From the range of pages, the

damage handler computes the clipping rectangle for the display update.

If the fbdev screen buffer ends near the beginning of a page, that page

could contain more scanlines. The damage handler would then track these

non-existing scanlines as dirty and provoke an out-of-bounds access

during the screen update. Hence, clip the maximum memory range to the

size of the screen buffer.

While at it, rename the variables min/max to min_off/max_off in

drm_fb_helper_deferred_io(). This avoids confusion with the macros of

the same name.