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| author | Sage Weil <sage@inktank.com> | 2012-07-30 16:20:25 -0700 |
|---|---|---|
| committer | Sage Weil <sage@inktank.com> | 2012-07-30 18:15:31 -0700 |
| commit | a4107026976f06c9a6ce8cc84a763564ee39d901 (patch) | |
| tree | f8f83ffd302b50f9296fb36cc046409feafd597c | |
| parent | 6194ea895e447fdf4adfd23f67873a32bf4f15ae (diff) | |
| download | linux-a4107026976f06c9a6ce8cc84a763564ee39d901.tar.gz linux-a4107026976f06c9a6ce8cc84a763564ee39d901.tar.bz2 linux-a4107026976f06c9a6ce8cc84a763564ee39d901.zip | |
libceph: (re)initialize bio_iter on start of message receive
Previously, we were opportunistically initializing the bio_iter if it
appeared to be uninitialized in the middle of the read path. The problem
is that a sequence like:
- start reading message
- initialize bio_iter
- read half a message
- messenger fault, reconnect
- restart reading message
- ** bio_iter now non-NULL, not reinitialized **
- read past end of bio, crash
Instead, initialize the bio_iter unconditionally when we allocate/claim
the message for read.
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>
| -rw-r--r-- | net/ceph/messenger.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index e65b15d5d8b9..f1bd3bbb0c46 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -1872,6 +1872,11 @@ static int read_partial_message(struct ceph_connection *con) else con->in_msg_pos.page_pos = 0; con->in_msg_pos.data_pos = 0; + +#ifdef CONFIG_BLOCK + if (m->bio) + init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg); +#endif } /* front */ @@ -1888,10 +1893,6 @@ static int read_partial_message(struct ceph_connection *con) if (ret <= 0) return ret; } -#ifdef CONFIG_BLOCK - if (m->bio && !m->bio_iter) - init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg); -#endif /* (page) data */ while (con->in_msg_pos.data_pos < data_len) { @@ -1902,7 +1903,7 @@ static int read_partial_message(struct ceph_connection *con) return ret; #ifdef CONFIG_BLOCK } else if (m->bio) { - + BUG_ON(!m->bio_iter); ret = read_partial_message_bio(con, &m->bio_iter, &m->bio_seg, data_len, do_datacrc); |