CVE-2021-47338

In the Linux kernel, the following vulnerability has been resolved: fbmem:
Do not delete the mode that is still in use The execution of
fb_delete_videomode() is not based on the result of the previous
fbcon_mode_deleted(). As a result, the mode is directly deleted, regardless
of whether it is still in use, which may cause UAF.
================================================================== BUG:
KASAN: use-after-free in fb_mode_is_equal+0x36e/0x5e0
drivers/video/fbdev/core/modedb.c:924 Read of size 4 at addr
ffff88807e0ddb1c by task syz-executor.0/18962 CPU: 2 PID: 18962 Comm:
syz-executor.0 Not tainted 5.10.45-rc1+ #3 Hardware name: QEMU Standard PC
(i440FX + PIIX, 1996), BIOS … Call Trace: __dump_stack
lib/dump_stack.c:77 [inline] dump_stack+0x137/0x1be lib/dump_stack.c:118
print_address_description+0x6c/0x640 mm/kasan/report.c:385 __kasan_report
mm/kasan/report.c:545 [inline] kasan_report+0x13d/0x1e0
mm/kasan/report.c:562 fb_mode_is_equal+0x36e/0x5e0
drivers/video/fbdev/core/modedb.c:924 fbcon_mode_deleted+0x16a/0x220
drivers/video/fbdev/core/fbcon.c:2746 fb_set_var+0x1e1/0xdb0
drivers/video/fbdev/core/fbmem.c:975 do_fb_ioctl+0x4d9/0x6e0
drivers/video/fbdev/core/fbmem.c:1108 vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xfb/0x170
fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 18960:
kasan_save_stack mm/kasan/common.c:48 [inline] kasan_set_track+0x3d/0x70
mm/kasan/common.c:56 kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355
__kasan_slab_free+0x108/0x140 mm/kasan/common.c:422 slab_free_hook
mm/slub.c:1541 [inline] slab_free_freelist_hook+0xd6/0x1a0 mm/slub.c:1574
slab_free mm/slub.c:3139 [inline] kfree+0xca/0x3d0 mm/slub.c:4121
fb_delete_videomode+0x56a/0x820 drivers/video/fbdev/core/modedb.c:1104
fb_set_var+0x1f3/0xdb0 drivers/video/fbdev/core/fbmem.c:978
do_fb_ioctl+0x4d9/0x6e0 drivers/video/fbdev/core/fbmem.c:1108 vfs_ioctl
fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739 do_syscall_64+0x2d/0x70
arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9