CVE-2022-50101

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> video: fbdev: vt8623fb: Check the size of screen before memset_io()<br /> <br /> In the function vt8623fb_set_par(), the value of &amp;#39;screen_size&amp;#39; is<br /> calculated by the user input. If the user provides the improper value,<br /> the value of &amp;#39;screen_size&amp;#39; may larger than &amp;#39;info-&gt;screen_size&amp;#39;, which<br /> may cause the following bug:<br /> <br /> [ 583.339036] BUG: unable to handle page fault for address: ffffc90005000000<br /> [ 583.339049] #PF: supervisor write access in kernel mode<br /> [ 583.339052] #PF: error_code(0x0002) - not-present page<br /> [ 583.339074] RIP: 0010:memset_orig+0x33/0xb0<br /> [ 583.339110] Call Trace:<br /> [ 583.339118] vt8623fb_set_par+0x11cd/0x21e0<br /> [ 583.339146] fb_set_var+0x604/0xeb0<br /> [ 583.339181] do_fb_ioctl+0x234/0x670<br /> [ 583.339209] fb_ioctl+0xdd/0x130<br /> <br /> Fix the this by checking the value of &amp;#39;screen_size&amp;#39; before memset_io().