libceph: gracefully handle large reply messages from the mon
commit 73c3d4812b4c755efeca0140f606f83772a39ce4 upstream. We preallocate a few of the message types we get back from the mon. If we get a larger message than we are expecting, fall back to trying to allocate a new one instead of blindly using the one we have. Signed-off-by: Sage Weil <sage@redhat.com> Reviewed-by: Ilya Dryomov <ilya.dryomov@inktank.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1041,7 +1041,15 @@ static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
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if (!m) {
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pr_info("alloc_msg unknown type %d\n", type);
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*skip = 1;
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} else if (front_len > m->front_alloc_len) {
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pr_warning("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
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front_len, m->front_alloc_len,
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(unsigned int)con->peer_name.type,
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le64_to_cpu(con->peer_name.num));
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ceph_msg_put(m);
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m = ceph_msg_new(type, front_len, GFP_NOFS, false);
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}
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return m;
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}
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