Subject: [PATCH net] net: stmmac: Add page sanity check

From: Jose Abreu <[email-masked]>
Date: Fri, 19 Jul 2019 12:21:44 +0200

Add a WARN_ON() when page is NULL.

Signed-off-by: Jose Abreu <[email-masked]>

---
Cc: Giuseppe Cavallaro <[email-masked]>
Cc: Alexandre Torgue <[email-masked]>
Cc: Jose Abreu <[email-masked]>
Cc: "David S. Miller" <[email-masked]>
Cc: Maxime Coquelin <[email-masked]>
Cc: [email-masked]
Cc: [email-masked]
Cc: [email-masked]
Cc: [email-masked]
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 5f1294ce0216..eac6920301e9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3350,6 +3350,8 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
 		entry = next_entry;
 		buf = &rx_q->buf_pool[entry];
 
+		WARN_ON(!buf->page);
+
 		if (priv->extend_desc)
 			p = (struct dma_desc *)(rx_q->dma_erx + entry);
 		else
-- 
2.7.4