CVE-2026-53303 f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show()

In the Linux kernel, the following vulnerability has been resolved: f2fs: protect extensionlist reading with sblock in f2fssbishow In f2fssbishow, the extensionlist, extensioncount and hotextcount are read without holding sbi-sblock. If a concurrent sysfs store modifies the extension list via...