[TIPC]: Prevent name table corruption if no room for new publication

Now exits cleanly if attempt to allocate larger array of subsequences fails,
without losing track of pointer to existing array.
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Per Liden <per.liden@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/name_table.c

@@ -284,18 +284,18 @@ static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
 		/* Ensure there is space for new sub-sequence */
 
 		if (nseq->first_free == nseq->alloc) {
-			struct sub_seq *sseqs = nseq->sseqs;
-			nseq->sseqs = tipc_subseq_alloc(nseq->alloc * 2);
-			if (nseq->sseqs != NULL) {
-				memcpy(nseq->sseqs, sseqs,
-				       nseq->alloc * sizeof (struct sub_seq));
-				kfree(sseqs);
-				dbg("Allocated %u sseqs\n", nseq->alloc);
-				nseq->alloc *= 2;
-			} else {
+			struct sub_seq *sseqs = tipc_subseq_alloc(nseq->alloc * 2);
+
+			if (!sseqs) {
 				warn("Memory squeeze; failed to create sub-sequence\n");
 				return NULL;
 			}
+			dbg("Allocated %u more sseqs\n", nseq->alloc);
+			memcpy(sseqs, nseq->sseqs,
+			       nseq->alloc * sizeof(struct sub_seq));
+			kfree(nseq->sseqs);
+			nseq->sseqs = sseqs;
+			nseq->alloc *= 2;
 		}
 		dbg("Have %u sseqs for type %u\n", nseq->alloc, type);