[PATCH] ethernet/netronome/nfp: Fix a use after free in nfp_bpf_ctrl_msg_rx

[Lv Yunlong]

In nfp_bpf_ctrl_msg_rx, if
nfp_ccm_get_type(skb) == NFP_CCM_TYPE_BPF_BPF_EVENT is true, the skb
will be freed. But the skb is still used by nfp_ccm_rx(&bpf->ccm, skb).

My patch adds a return when the skb was freed.

Fixes: bcf0cafab44fd ("nfp: split out common control message handling code")
Signed-off-by: Lv Yunlong <lyl2...@mail.ustc.edu.cn>
---
 drivers/net/ethernet/netronome/nfp/bpf/cmsg.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c 
b/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c
index 0e2db6ea79e9..2ec62c8d86e1 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c
@@ -454,6 +454,7 @@ void nfp_bpf_ctrl_msg_rx(struct nfp_app *app, struct 
sk_buff *skb)
                        dev_consume_skb_any(skb);
                else
                        dev_kfree_skb_any(skb);
+               return;
        }
 
        nfp_ccm_rx(&bpf->ccm, skb);
-- 
2.25.1