diff options
| author | Jan Kara <jack@suse.cz> | 2018-06-13 12:09:22 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-03 11:21:34 +0200 |
| commit | fc98ab45a8363167f8dbbf881852ad3dcca57177 (patch) | |
| tree | 766b790ae02e6688cf79c8391dc78bd07a10147c /fs/udf | |
| parent | 009aa1cd676e7d5b88368c0951a5894a5cad4766 (diff) | |
udf: Detect incorrect directory size
commit fa65653e575fbd958bdf5fb9c4a71a324e39510d upstream.
Detect when a directory entry is (possibly partially) beyond directory
size and return EIO in that case since it means the filesystem is
corrupted. Otherwise directory operations can further corrupt the
directory and possibly also oops the kernel.
CC: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
CC: stable@vger.kernel.org
Reported-and-tested-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/udf')
| -rw-r--r-- | fs/udf/directory.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/udf/directory.c b/fs/udf/directory.c index c763fda257bf..637114e8c7fd 100644 --- a/fs/udf/directory.c +++ b/fs/udf/directory.c @@ -150,6 +150,9 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos, sizeof(struct fileIdentDesc)); } } + /* Got last entry outside of dir size - fs is corrupted! */ + if (*nf_pos > dir->i_size) + return NULL; return fi; } |