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    Subject[PATCH 5.14 15/24] isofs: Fix out of bound access for corrupted isofs image
    Date
    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;

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