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| author | Alex Elder <elder@inktank.com> | 2013-04-05 21:46:01 +0200 |
|---|---|---|
| committer | Sage Weil <sage@inktank.com> | 2013-05-02 06:18:27 +0200 |
| commit | f759ebb968dbf185fc079dd2e824b1aa3a3d71aa (patch) | |
| tree | 4a1e7615ba84e4ddcdc87051e542a654a909d92e /net/ceph/messenger.c | |
| parent | libceph: fix possible CONFIG_BLOCK build problem (diff) | |
| download | linux-f759ebb968dbf185fc079dd2e824b1aa3a3d71aa.tar.xz linux-f759ebb968dbf185fc079dd2e824b1aa3a3d71aa.zip | |
libceph: skip message if too big to receive
We know the length of our message buffers. If we get a message
that's too long, just dump it and ignore it. If skip was set
then con->in_msg won't be valid, so be careful not to dereference
a null pointer in the process.
This resolves:
http://tracker.ceph.com/issues/4664
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Diffstat (limited to 'net/ceph/messenger.c')
| -rw-r--r-- | net/ceph/messenger.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index 994192beda02..cb5b4e6733f0 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -2207,10 +2207,18 @@ static int read_partial_message(struct ceph_connection *con) ret = ceph_con_in_msg_alloc(con, &skip); if (ret < 0) return ret; + + BUG_ON(!con->in_msg ^ skip); + if (con->in_msg && data_len > con->in_msg->data_length) { + pr_warning("%s skipping long message (%u > %zd)\n", + __func__, data_len, con->in_msg->data_length); + ceph_msg_put(con->in_msg); + con->in_msg = NULL; + skip = 1; + } if (skip) { /* skip this message */ dout("alloc_msg said skip message\n"); - BUG_ON(con->in_msg); con->in_base_pos = -front_len - middle_len - data_len - sizeof(m->footer); con->in_tag = CEPH_MSGR_TAG_READY; |