linux-kernel - Re: [RFC-v4 7/9] iscsi-target: Refactor TX queue logic + export response PDU creation

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Message-ID: <CAMuHMdWVpF9G2v5oSYL642mpWdQCMGBhSQYa=Zw0s9DyoNJLjQ@mail.gmail.com>
Date:	Fri, 3 May 2013 23:04:50 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	target-devel <target-devel@...r.kernel.org>,
	linux-rdma <linux-rdma@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Roland Dreier <roland@...nel.org>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Alexander Nezhinsky <alexandern@...lanox.com>
Subject: Re: [RFC-v4 7/9] iscsi-target: Refactor TX queue logic + export
 response PDU creation

Hi Nicholas,

On Fri, Apr 12, 2013 at 10:52 PM, Nicholas A. Bellinger
<nab@...ux-iscsi.org> wrote:
> --- a/drivers/target/iscsi/iscsi_target.c
> +++ b/drivers/target/iscsi/iscsi_target.c

>  static int iscsit_send_reject(
>         struct iscsi_cmd *cmd,
>         struct iscsi_conn *conn)
> @@ -3505,18 +3548,9 @@ static int iscsit_send_reject(
>         struct iscsi_reject *hdr;
>         struct kvec *iov;
>
> -       hdr                     = (struct iscsi_reject *) cmd->pdu;

Woops, and now hdr is no longer initialized:

drivers/target/iscsi/iscsi_target.c: In function ‘iscsit_send_reject’:
drivers/target/iscsi/iscsi_target.c:3577: warning: ‘hdr’ is used
uninitialized in this function

> -       hdr->opcode             = ISCSI_OP_REJECT;
> -       hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
> -       hton24(hdr->dlength, ISCSI_HDR_LEN);
> -       hdr->ffffffff           = cpu_to_be32(0xffffffff);
> -       cmd->stat_sn            = conn->stat_sn++;
> -       hdr->statsn             = cpu_to_be32(cmd->stat_sn);
> -       hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
> -       hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
> +       iscsit_build_reject(cmd, conn, (struct iscsi_reject *)&cmd->pdu[0]);

Hence it will crash later:

                iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
                                (unsigned char *)hdr, ISCSI_HDR_LEN,
                                0, NULL, (u8 *)header_digest);

and

        pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
                " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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