From: Jan Kara Date: Wed, 7 Jan 2015 12:49:08 +0000 (+0100) Subject: udf: Check length of extended attributes and allocation descriptors X-Git-Tag: firefly_0821_release~3679^2~42 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4d2c033d846d0cf835ecb2ab6f3e3d0e002b915d;p=firefly-linux-kernel-4.4.55.git 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. Reported-by: Carl Henrik Lunde Cc: stable@vger.kernel.org Signed-off-by: Jan Kara Signed-off-by: Jiri Slaby [Jan and Jiri fixed it in 3.12 stable, i ported it to 3.10 stable, replaced bs by inode->i_sb->s_blocksize] Signed-off-by: Zhang Zhen Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/udf/inode.c b/fs/udf/inode.c index aa023283cc8a..789814f27438 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -1495,6 +1495,16 @@ 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) + return; + /* Now do exact checks */ + if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > inode->i_sb->s_blocksize) + return; + switch (fe->icbTag.fileType) { case ICBTAG_FILE_TYPE_DIRECTORY: inode->i_op = &udf_dir_inode_operations;