fbmem: Check virtual screen sizes in fb_set_var()

mainline inclusion
from mainline-v5.19-rc6
commit 6c11df58
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5IQ4M


CVE: CVE-2021-33655

--------------------------------

Verify that the fbdev or drm driver correctly adjusted the virtual
screen sizes. On failure report the failing driver and reject the screen
size change.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: stable@vger.kernel.org # v5.4+
Signed-off-by: Chen Jun <chenjun102@huawei.com>

Conflicts:
	drivers/video/fbdev/core/fbmem.c
Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>