[PATCH] nfp: bpf: Add check for nfp_app_ctrl_msg_alloc()

[Haoxiang Li]

Add check for the return value of nfp_app_ctrl_msg_alloc() in
nfp_bpf_cmsg_alloc() to prevent null pointer dereference.

Fixes: ff3d43f7568c ("nfp: bpf: implement helpers for FW map ops")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Haoxiang Li <haoxiang_li2024@xxxxxxx>
---
 drivers/net/ethernet/netronome/nfp/bpf/cmsg.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c b/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c
index 2ec62c8d86e1..09ea1bc72097 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/cmsg.c
@@ -20,6 +20,9 @@ nfp_bpf_cmsg_alloc(struct nfp_app_bpf *bpf, unsigned int size)
 	struct sk_buff *skb;
 
 	skb = nfp_app_ctrl_msg_alloc(bpf->app, size, GFP_KERNEL);
+	if (!skb) {
+		return NULL;
+	}
 	skb_put(skb, size);
 
 	return skb;
-- 
2.25.1