On 04/28, Chao Yu wrote: > As Yanming reported in bugzilla: > > https://bugzilla.kernel.org/show_bug.cgi?id=215895 > > I have encountered a bug in F2FS file system in kernel v5.17. > > The kernel message is shown below: > > kernel BUG at fs/inode.c:611! > Call Trace: > evict+0x282/0x4e0 > __dentry_kill+0x2b2/0x4d0 > dput+0x2dd/0x720 > do_renameat2+0x596/0x970 > __x64_sys_rename+0x78/0x90 > do_syscall_64+0x3b/0x90 > > The root cause is: fuzzed inode has both inline_data flag and encrypted > flag, so after it was deleted by rename(), during f2fs_evict_inode(), > it will cause inline data conversion due to flags confilction, then > page cache will be polluted and trigger panic in clear_inode(). > > This patch tries to fix the issue by do more sanity checks for inline > data inode in sanity_check_inode(). > > Cc: stable@xxxxxxxxxxxxxxx > Reported-by: Ming Yan <yanming@xxxxxxxxxx> > Signed-off-by: Chao Yu <chao.yu@xxxxxxxx> > --- > fs/f2fs/f2fs.h | 7 +++++++ > fs/f2fs/inode.c | 3 +-- > 2 files changed, 8 insertions(+), 2 deletions(-) > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index 27aa93caec06..64c511b498cc 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -4173,6 +4173,13 @@ static inline void f2fs_set_encrypted_inode(struct inode *inode) > */ > static inline bool f2fs_post_read_required(struct inode *inode) > { > + /* > + * used by sanity_check_inode(), when disk layout fields has not > + * been synchronized to inmem fields. > + */ > + if (file_is_encrypt(inode) || file_is_verity(inode) || > + F2FS_I(inode)->i_flags & F2FS_COMPR_FL) > + return true; > return f2fs_encrypted_file(inode) || fsverity_active(inode) || > f2fs_compressed_file(inode); > } > diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c > index 83639238a1fe..234b8ed02644 100644 > --- a/fs/f2fs/inode.c > +++ b/fs/f2fs/inode.c > @@ -276,8 +276,7 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page) > } > } > > - if (f2fs_has_inline_data(inode) && > - (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode))) { > + if (f2fs_has_inline_data(inode) && !f2fs_may_inline_data(inode)) { BTW, why can't we just check the above on-disk fields here only? > set_sbi_flag(sbi, SBI_NEED_FSCK); > f2fs_warn(sbi, "%s: inode (ino=%lx, mode=%u) should not have inline_data, run fsck to fix", > __func__, inode->i_ino, inode->i_mode); > -- > 2.25.1
