Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:EOL][EOL]drm/fb-helper: Fix out-of-bounds access[EOL][EOL]Clip memory range to screen-buffer size to avoid out-of-bounds access[EOL]in fbdev deferred I/O's damage handling.[EOL][EOL]Fbdev's deferred I/O can only track pages. From the range of pages, the[EOL]damage handler computes the clipping rectangle for the display update.[EOL]If the fbdev screen buffer ends near the beginning of a page, that page[EOL]could contain more scanlines. The damage handler would then track these[EOL]non-existing scanlines as dirty and provoke an out-of-bounds access[EOL]during the screen update. Hence, clip the maximum memory range to the[EOL]size of the screen buffer.[EOL][EOL]While at it, rename the variables min/max to min_off/max_off in[EOL]drm_fb_helper_deferred_io(). This avoids confusion with the macros of[EOL]the same name.

CREATE(Triage):(User=lchen-cn) [CVE-2022-50221 (https://nvd.nist.gov/vuln/detail/CVE-2022-50221)