linux-kernel - [PATCH 5.10 36/43] can: mcp251xfd: mcp251xfd_handle_rxif

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Date:   Fri, 22 Jan 2021 15:12:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Qinglang Miao <miaoqinglang@...wei.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 5.10 36/43] can: mcp251xfd: mcp251xfd_handle_rxif_one(): fix wrong NULL pointer check

From: Qinglang Miao <miaoqinglang@...wei.com>

[ Upstream commit ca4c6ebeeb50112f5178f14bfb6d9e8ddf148545 ]

If alloc_canfd_skb() returns NULL, 'cfg' is an uninitialized variable, so we
should check 'skb' rather than 'cfd' after calling alloc_canfd_skb(priv->ndev,
&cfd).

Fixes: 55e5b97f003e ("can: mcp25xxfd: add driver for Microchip MCP25xxFD SPI CAN")
Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Link: https://lore.kernel.org/r/20210113073100.79552-1-miaoqinglang@huawei.com
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@@ -1432,7 +1432,7 @@ mcp251xfd_handle_rxif_one(struct mcp251x
 	else
 		skb = alloc_can_skb(priv->ndev, (struct can_frame **)&cfd);
 
-	if (!cfd) {
+	if (!skb) {
 		stats->rx_dropped++;
 		return 0;
 	}