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-rw-r--r--net/tipc/bcast.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index d9d848d488e..e5f3da50782 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -611,6 +611,7 @@ static int tipc_bcbearer_send(struct sk_buff *buf,
struct tipc_bearer *p = bcbearer->bpairs[bp_index].primary;
struct tipc_bearer *s = bcbearer->bpairs[bp_index].secondary;
struct tipc_bearer *b = p;
+ struct sk_buff *tbuf;
if (!p)
break; /* No more bearers to try */
@@ -626,7 +627,17 @@ static int tipc_bcbearer_send(struct sk_buff *buf,
if (bcbearer->remains_new.count == bcbearer->remains.count)
continue; /* Nothing added by bearer pair */
- tipc_bearer_send(b, buf, &b->bcast_addr);
+ if (bp_index == 0) {
+ /* Use original buffer for first bearer */
+ tipc_bearer_send(b, buf, &b->bcast_addr);
+ } else {
+ /* Avoid concurrent buffer access */
+ tbuf = pskb_copy(buf, GFP_ATOMIC);
+ if (!tbuf)
+ break;
+ tipc_bearer_send(b, tbuf, &b->bcast_addr);
+ kfree_skb(tbuf); /* Bearer keeps a clone */
+ }
/* Swap bearers for next packet */
if (s) {