From afbd40f425227e661d991757e11cc4db024e761f Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Mon, 18 Oct 2021 12:37:41 +0200 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- fs/isofs/inode.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c index f1134752cea3..ee3c92390413 100644 --- a/fs/isofs/inode.c +++ b/fs/isofs/inode.c @@ -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; -- 2.20.1