[CCID2]: Remove ugly BUG_ON

This removes an ugly BUG_ON which has been pointed out by Arnaldo.

Instead of freezing up the machine, a `critical' message is now issued
to the system log.

There is potential of doing this more gracefully (eg. there are a few
internal variables which could be updated despite the lack of memory),
but that requires more complicated changes to the algorithm; thus a
`FIXME' has been added.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 6 deletions

diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 5c6b4f97a66..3e4fa6b6f25 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -294,12 +294,11 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
         next = hctx->ccid2hctx_seqh->ccid2s_next;
         /* check if we need to alloc more space */
         if (next == hctx->ccid2hctx_seqt) {
-                int rc;
-
-                ccid2_pr_debug("allocating more space in history\n");
-                rc = ccid2_hc_tx_alloc_seq(hctx);
-                BUG_ON(rc); /* XXX what do we do? */
-
+                if (ccid2_hc_tx_alloc_seq(hctx)) {
+                        DCCP_CRIT("packet history - out of memory!");
+                        /* FIXME: find a more graceful way to bail out */
+                        return;
+                }
                 next = hctx->ccid2hctx_seqh->ccid2s_next;
                 BUG_ON(next == hctx->ccid2hctx_seqt);
         }