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authorAlex Elder <elder@inktank.com>2013-04-05 14:46:01 -0500
committerSage Weil <sage@inktank.com>2013-05-01 21:18:27 -0700
commitf759ebb968dbf185fc079dd2e824b1aa3a3d71aa (patch)
tree4a1e7615ba84e4ddcdc87051e542a654a909d92e /net/ceph
parentea96571f7b865edaf1acd472e6f2cddc9fb67892 (diff)
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')
-rw-r--r--net/ceph/messenger.c10
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;

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