From: Chao Yu chao@kernel.org
[ Upstream commit fcc2d8cc96b2f6141bbbe5b1e8953db990794b44 ]
It is possible that ino of dirent or orphan inode is corrupted in a fuzzed image, occasionally, if corrupted ino is equal to meta ino: meta_ino, node_ino or compress_ino, caller of f2fs_iget() from below call paths will get meta inode directly, it's not allowed, let's add sanity check to detect such cases.
case #1 - recover_dentry - __f2fs_find_entry - f2fs_iget_retry
case #2 - recover_orphan_inode - f2fs_iget_retry
Signed-off-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/inode.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-)
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index bd8960f4966b..cc91bcebd2ca 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -480,6 +480,12 @@ static int do_read_inode(struct inode *inode) return 0; }
+static bool is_meta_ino(struct f2fs_sb_info *sbi, unsigned int ino) +{ + return ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi) || + ino == F2FS_COMPRESS_INO(sbi); +} + struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) { struct f2fs_sb_info *sbi = F2FS_SB(sb); @@ -491,16 +497,21 @@ struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW)) { + if (is_meta_ino(sbi, ino)) { + f2fs_err(sbi, "inaccessible inode: %lu, run fsck to repair", ino); + set_sbi_flag(sbi, SBI_NEED_FSCK); + ret = -EFSCORRUPTED; + trace_f2fs_iget_exit(inode, ret); + iput(inode); + return ERR_PTR(ret); + } + trace_f2fs_iget(inode); return inode; } - if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi)) - goto make_now;
-#ifdef CONFIG_F2FS_FS_COMPRESSION - if (ino == F2FS_COMPRESS_INO(sbi)) + if (is_meta_ino(sbi, ino)) goto make_now; -#endif
ret = do_read_inode(inode); if (ret)