diff options
| author | Jan Kara <jack@suse.cz> | 2015-01-07 13:49:08 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-01 11:36:26 +0200 |
| commit | 34820fc89c5e635b7381e4060931ca30a63d110a (patch) | |
| tree | 670ed2d6435bce235dc787c0133d95ea6e390537 | |
| parent | 5f521316a9d5c70842744b8f3f872ab1a932711b (diff) | |
udf: Check length of extended attributes and allocation descriptors
commit 23b133bdc452aa441fcb9b82cbf6dd05cfd342d0 upstream.
Check length of extended attributes and allocation descriptors when
loading inodes from disk. Otherwise corrupted filesystems could confuse
the code and make the kernel oops.
This fixes CVE-2015-4167.
Reported-by: Carl Henrik Lunde <chlunde@ping.uio.no>
Signed-off-by: Jan Kara <jack@suse.cz>
[Use make_bad_inode() instead of branching due to older implementation.]
Signed-off-by: Chas Williams <3chas3@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/udf/inode.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/udf/inode.c b/fs/udf/inode.c index 287cd5f23421..142d29e3ccdf 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -1496,6 +1496,22 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh) iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint); } + /* + * Sanity check length of allocation descriptors and extended attrs to + * avoid integer overflows + */ + if (iinfo->i_lenEAttr > inode->i_sb->s_blocksize + || iinfo->i_lenAlloc > inode->i_sb->s_blocksize) { + make_bad_inode(inode); + return; + } + /* Now do exact checks */ + if (udf_file_entry_alloc_offset(inode) + + iinfo->i_lenAlloc > inode->i_sb->s_blocksize) { + make_bad_inode(inode); + return; + } + switch (fe->icbTag.fileType) { case ICBTAG_FILE_TYPE_DIRECTORY: inode->i_op = &udf_dir_inode_operations; |