From 98a0370898799895aa8f55109f54c33fcd8196b0 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Wed, 6 Mar 2013 23:39:39 -0600 Subject: [PATCH] libceph: don't clear bio_iter in prepare_write_message() At one time it was necessary to clear a message's bio_iter field to avoid a bad pointer dereference in write_partial_msg_pages(). That no longer seems to be the case. Here's why. The message's bio fields represent (in this case) outgoing data. Between where the bio_iter is made NULL in prepare_write_message() and the call in that function to prepare_message_data(), the bio fields are never used. In prepare_message_data(), init-bio_iter() is called, and the result of that overwrites the value in the message's bio_iter field. Because it gets overwritten anyway, there is no need to set it to NULL. So don't do it. This resolves: http://tracker.ceph.com/issues/4402 Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- net/ceph/messenger.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index e75a03d..17d9321 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -804,10 +804,6 @@ 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 (%zd)\n", m, con->out_seq, le16_to_cpu(m->hdr.type), -- 2.7.4