From 43643528cce60ca184fe8197efa8e8da7c89a037 Mon Sep 17 00:00:00 2001 From: "Yan, Zheng" Date: Wed, 6 Jun 2012 19:35:55 -0500 Subject: [PATCH] rbd: Clear ceph_msg->bio_iter for retransmitted message The bug can cause NULL pointer dereference in write_partial_msg_pages Signed-off-by: Zheng Yan Reviewed-by: Alex Elder --- net/ceph/messenger.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index 3857f815c035..769a2c9fe1af 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -649,6 +649,10 @@ static void prepare_write_message(struct ceph_connection *con) 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),