4.19-stable review patch. If anyone has any objections, please let me know.
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From: Youssef Samir quic_yabdulra@quicinc.com
[ Upstream commit f011b313e8ebd5b7abd8521b5119aecef403de45 ]
When broadcasting data to multiple nodes via MHI, using skb_clone() causes all nodes to receive the same header data. This can result in packets being discarded by endpoints, leading to lost data.
This issue occurs when a socket is closed, and a QRTR_TYPE_DEL_CLIENT packet is broadcasted. All nodes receive the same destination node ID, causing the node connected to the client to discard the packet and remain unaware of the client's deletion.
Replace skb_clone() with pskb_copy(), to create a separate copy of the header for each sk_buff.
Fixes: bdabad3e363d ("net: Add Qualcomm IPC router") Signed-off-by: Youssef Samir quic_yabdulra@quicinc.com Reviewed-by: Jeffery Hugo quic_jhugo@quicinc.com Reviewed-by: Carl Vanderlip quic_carlv@quicinc.com Reviewed-by: Chris Lew quic_clew@quicinc.com Link: https://patch.msgid.link/20240916170858.2382247-1-quic_yabdulra@quicinc.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/qrtr/qrtr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c index 128d0a48478d1..890a8fe51a9af 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -718,7 +718,7 @@ static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb,
mutex_lock(&qrtr_node_lock); list_for_each_entry(node, &qrtr_all_nodes, item) { - skbn = skb_clone(skb, GFP_KERNEL); + skbn = pskb_copy(skb, GFP_KERNEL); if (!skbn) break; skb_set_owner_w(skbn, skb->sk);