linux-kernel - [PATCH net-next] nfc: nci: fix possible NULL pointer dereference in send

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Message-Id: <20231013184129.18738-1-krzysztof.kozlowski@linaro.org>
Date:   Fri, 13 Oct 2023 20:41:29 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Samuel Ortiz <sameo@...ux.intel.com>,
        Frederic Danis <frederic.danis@...ux.intel.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     黄思聪 <huangsicong@....ac.cn>,
        stable@...r.kernel.org
Subject: [PATCH net-next] nfc: nci: fix possible NULL pointer dereference in send_acknowledge()

Handle memory allocation failure from nci_skb_alloc() (calling
alloc_skb()) to avoid possible NULL pointer dereference.

Reported-by: 黄思聪 <huangsicong@....ac.cn>
Fixes: 391d8a2da787 ("NFC: Add NCI over SPI receive")
Cc: <stable@...r.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 net/nfc/nci/spi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/nfc/nci/spi.c b/net/nfc/nci/spi.c
index 0935527d1d12..b68150c971d0 100644
--- a/net/nfc/nci/spi.c
+++ b/net/nfc/nci/spi.c
@@ -151,6 +151,8 @@ static int send_acknowledge(struct nci_spi *nspi, u8 acknowledge)
 	int ret;
 
 	skb = nci_skb_alloc(nspi->ndev, 0, GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
 
 	/* add the NCI SPI header to the start of the buffer */
 	hdr = skb_push(skb, NCI_SPI_HDR_LEN);
-- 
2.34.1