f2fs: fix null-ptr-deref in f2fs_submit_page_bio()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix null-ptr-deref in f2fs_submit_page_bio() There's issue as follows when concurrently installing the f2fs.ko module and mounting the f2fs file system: KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] RIP: 0010:__bio_alloc+0x2fb/0x6c0 [f2fs] Call Trace: <TASK> f2fs_submit_page_bio+0x126/0x8b0 [f2fs] __get_meta_page+0x1d4/0x920 [f2fs] get_checkpoint_version.constprop.0+0x2b/0x3c0 [f2fs] validate_checkpoint+0xac/0x290 [f2fs] f2fs_get_valid_checkpoint+0x207/0x950 [f2fs] f2fs_fill_super+0x1007/0x39b0 [f2fs] mount_bdev+0x183/0x250 legacy_get_tree+0xf4/0x1e0 vfs_get_tree+0x88/0x340 do_new_mount+0x283/0x5e0 path_mount+0x2b2/0x15b0 __x64_sys_mount+0x1fe/0x270 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e Above issue happens as the biset of the f2fs file system is not initialized before register "f2fs_fs_type". To address above issue just register "f2fs_fs_type" at the last in init_f2fs_fs(). Ensure that all f2fs file system resources are initialized.

References

• https://git.kernel.org/stable/c/4289be8465924748daa9bf14866eb7f0987d4e39
• https://git.kernel.org/stable/c/bd9197b72d772be7bccc3b66c83a3157cfe2f96f
• https://git.kernel.org/stable/c/8dddc12d03248755d9f709bc1eb9e3ea2bf1b322
• https://git.kernel.org/stable/c/32f5e291b7677495f98246eec573767430321c08
• https://git.kernel.org/stable/c/9e11b1d5fda972f6be60ab732976a7c8e064cd56
• https://git.kernel.org/stable/c/b7d0a97b28083084ebdd8e5c6bccd12e6ec18faa