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| author | Chao Yu <yuchao0@huawei.com> | 2019-09-10 09:14:16 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2019-09-16 08:38:26 -0700 |
| commit | 98194030554cd9b10568a9b58f5a135c7e7cba85 (patch) | |
| tree | 75243346db60e853d5a5b36dc366efdb5e205c68 /fs/f2fs | |
| parent | 743b620cb0516f6b6cbc45b48df00fe6d14d00ba (diff) | |
| download | linux-98194030554cd9b10568a9b58f5a135c7e7cba85.tar.bz2 | |
f2fs: fix to avoid accessing uninitialized field of inode page in is_alive()
If inode is newly created, inode page may not synchronize with inode cache,
so fields like .i_inline or .i_extra_isize could be wrong, in below call
path, we may access such wrong fields, result in failing to migrate valid
target block.
Thread A Thread B
- f2fs_create
- f2fs_add_link
- f2fs_add_dentry
- f2fs_init_inode_metadata
- f2fs_add_inline_entry
- f2fs_new_inode_page
- f2fs_put_page
: inode page wasn't updated with inode cache
- gc_data_segment
- is_alive
- f2fs_get_node_page
- datablock_addr
- offset_in_addr
: access uninitialized fields
Fixes: 7a2af766af15 ("f2fs: enhance on-disk inode structure scalability")
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
| -rw-r--r-- | fs/f2fs/dir.c | 5 | ||||
| -rw-r--r-- | fs/f2fs/inline.c | 5 |
2 files changed, 10 insertions, 0 deletions
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c index 7afbf8f5ab08..4033778bcbbf 100644 --- a/fs/f2fs/dir.c +++ b/fs/f2fs/dir.c @@ -682,6 +682,11 @@ add_dentry: if (inode) { f2fs_i_pino_write(inode, dir->i_ino); + + /* synchronize inode page's data from inode cache */ + if (is_inode_flag_set(inode, FI_NEW_INODE)) + f2fs_update_inode(inode, page); + f2fs_put_page(page, 1); } diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c index 16ebdd4d1f2c..896db0416f0e 100644 --- a/fs/f2fs/inline.c +++ b/fs/f2fs/inline.c @@ -589,6 +589,11 @@ int f2fs_add_inline_entry(struct inode *dir, const struct qstr *new_name, /* we don't need to mark_inode_dirty now */ if (inode) { f2fs_i_pino_write(inode, dir->i_ino); + + /* synchronize inode page's data from inode cache */ + if (is_inode_flag_set(inode, FI_NEW_INODE)) + f2fs_update_inode(inode, page); + f2fs_put_page(page, 1); } |