From: YueHaibing <yuehaibing@xxxxxxxxxx> [ 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@xxxxxxxxxx> Link: https://lore.kernel.org/r/20221203094635.29024-1-yuehaibing@xxxxxxxxxx Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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 8f2ee71c63c6..b653d16ab21f 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -1971,7 +1971,9 @@ 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); -- 2.35.1