From: Jan Kara <[email protected]> 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 <[email protected]> Signed-off-by: Jan Kara <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> [Use make_bad_inode() instead of branching due to older implementation.] Signed-off-by: Chas Williams <[email protected]> --- fs/udf/inode.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/fs/udf/inode.c b/fs/udf/inode.c index 287cd5f..142d29e 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; -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
