From: Jan Kara jack@suse.cz
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 --- fs/isofs/inode.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/fs/isofs/inode.c +++ b/fs/isofs/inode.c @@ -1322,6 +1322,8 @@ static int isofs_read_inode(struct inode
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;