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| author | Theodore Ts'o <tytso@mit.edu> | 2018-05-22 23:14:07 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2018-05-22 23:14:07 +0200 |
| commit | eb9b5f01c33adebc31cbc236c02695f605b0e417 (patch) | |
| tree | 22cc5a91463b52193fdf1c6dc0465a33c767fd78 | |
| parent | ext4: do not allow external inodes for inline data (diff) | |
| download | linux-eb9b5f01c33adebc31cbc236c02695f605b0e417.tar.xz linux-eb9b5f01c33adebc31cbc236c02695f605b0e417.zip | |
ext4: bubble errors from ext4_find_inline_data_nolock() up to ext4_iget()
If ext4_find_inline_data_nolock() returns an error it needs to get
reflected up to ext4_iget(). In order to fix this,
ext4_iget_extra_inode() needs to return an error (and not return
void).
This is related to "ext4: do not allow external inodes for inline
data" (which fixes CVE-2018-11412) in that in the errors=continue
case, it would be useful to for userspace to receive an error
indicating that file system is corrupted.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Cc: stable@kernel.org
| -rw-r--r-- | fs/ext4/inode.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 58301a697379..2ea07efbe016 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4701,19 +4701,21 @@ static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode, } } -static inline void ext4_iget_extra_inode(struct inode *inode, +static inline int ext4_iget_extra_inode(struct inode *inode, struct ext4_inode *raw_inode, struct ext4_inode_info *ei) { __le32 *magic = (void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize; + if (EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize + sizeof(__le32) <= EXT4_INODE_SIZE(inode->i_sb) && *magic == cpu_to_le32(EXT4_XATTR_MAGIC)) { ext4_set_inode_state(inode, EXT4_STATE_XATTR); - ext4_find_inline_data_nolock(inode); + return ext4_find_inline_data_nolock(inode); } else EXT4_I(inode)->i_inline_off = 0; + return 0; } int ext4_get_projid(struct inode *inode, kprojid_t *projid) @@ -4913,7 +4915,9 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino) ei->i_extra_isize = sizeof(struct ext4_inode) - EXT4_GOOD_OLD_INODE_SIZE; } else { - ext4_iget_extra_inode(inode, raw_inode, ei); + ret = ext4_iget_extra_inode(inode, raw_inode, ei); + if (ret) + goto bad_inode; } } |