Commit b0ddff8d authored Oct 18, 2021 by Jan Kara Committed by Greg Kroah-Hartman Nov 12, 2021

isofs: Fix out of bound access for corrupted isofs image



commit e96a1866b40570b5950cda8602c2819189c62a48 upstream.

When isofs image is suitably corrupted isofs_read_inode() can read data
beyond the end of buffer. Sanity-check the directory entry length before
using it.

Reported-and-tested-by:  <syzbot+6fc7fb214625d82af7d1@syzkaller.appspotmail.com>
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent a9342139

fs/isofs/inode.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1326,6 +1326,8 @@ static int isofs_read_inode(struct inode *inode, int relocated)

		de = (struct iso_directory_record *) (bh->b_data + offset);
		de_len = (unsigned char ) de;
		if (de_len < sizeof(struct iso_directory_record))
		goto fail;

		if (offset + de_len > bufsize) {
		int frag1 = bufsize - offset;