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    Subject[ 085/171] rbd: Clear ceph_msg->bio_iter for retransmitted message
    Date
    3.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: "Yan, Zheng" <zheng.z.yan@intel.com>

    (cherry picked from commit 43643528cce60ca184fe8197efa8e8da7c89a037)
    (cherry picked from commit b132cf4c733f91bb4dd2277ea049243cf16e8b66)

    The bug can cause NULL pointer dereference in write_partial_msg_pages

    Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
    Reviewed-by: Alex Elder <elder@inktank.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/ceph/messenger.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/net/ceph/messenger.c
    +++ b/net/ceph/messenger.c
    @@ -563,6 +563,10 @@ static void prepare_write_message(struct
    m->hdr.seq = cpu_to_le64(++con->out_seq);
    m->needs_out_seq = false;
    }
    +#ifdef CONFIG_BLOCK
    + else
    + m->bio_iter = NULL;
    +#endif

    dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
    m, con->out_seq, le16_to_cpu(m->hdr.type),



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