CVE-2025-40137

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> f2fs: fix to truncate first page in error path of f2fs_truncate()<br /> <br /> syzbot reports a bug as below:<br /> <br /> loop0: detected capacity change from 0 to 40427<br /> F2FS-fs (loop0): Wrong SSA boundary, start(3584) end(4096) blocks(3072)<br /> F2FS-fs (loop0): Can&amp;#39;t find valid F2FS filesystem in 1th superblock<br /> F2FS-fs (loop0): invalid crc value<br /> F2FS-fs (loop0): f2fs_convert_inline_folio: corrupted inline inode ino=3, i_addr[0]:0x1601, run fsck to fix.<br /> ------------[ cut here ]------------<br /> kernel BUG at fs/inode.c:753!<br /> RIP: 0010:clear_inode+0x169/0x190 fs/inode.c:753<br /> Call Trace:<br /> <br /> evict+0x504/0x9c0 fs/inode.c:810<br /> f2fs_fill_super+0x5612/0x6fa0 fs/f2fs/super.c:5047<br /> get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692<br /> vfs_get_tree+0x8f/0x2b0 fs/super.c:1815<br /> do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808<br /> do_mount fs/namespace.c:4136 [inline]<br /> __do_sys_mount fs/namespace.c:4347 [inline]<br /> __se_sys_mount+0x317/0x410 fs/namespace.c:4324<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> During f2fs_evict_inode(), clear_inode() detects that we missed to truncate<br /> all page cache before destorying inode, that is because in below path, we<br /> will create page #0 in cache, but missed to drop it in error path, let&amp;#39;s fix<br /> it.<br /> <br /> - evict<br /> - f2fs_evict_inode<br /> - f2fs_truncate<br /> - f2fs_convert_inline_inode<br /> - f2fs_grab_cache_folio<br /> : create page #0 in cache<br /> - f2fs_convert_inline_folio<br /> : sanity check failed, return -EFSCORRUPTED<br /> - clear_inode detects that inode-&gt;i_data.nrpages is not zero