From: YueHaibing yuehaibing@huawei.com
[ Upstream commit 743117a997bbd4840e827295c07e59bcd7f7caa3 ]
Fix the potential risk of OOB if skb_linearize() fails in tipc_link_proto_rcv().
Fixes: 5cbb28a4bf65 ("tipc: linearize arriving NAME_DISTR and LINK_PROTO buffers") Signed-off-by: YueHaibing yuehaibing@huawei.com Link: https://lore.kernel.org/r/20221203094635.29024-1-yuehaibing@huawei.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/tipc/link.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/tipc/link.c b/net/tipc/link.c index d3017811b67a..edcc768a17ce 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -1477,7 +1477,9 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, if (tipc_own_addr(l->net) > msg_prevnode(hdr)) l->net_plane = msg_net_plane(hdr);
- skb_linearize(skb); + if (skb_linearize(skb)) + goto exit; + hdr = buf_msg(skb); data = msg_data(hdr);