linux-kernel - [PATCH] nfc: fix a NULL pointer dereference

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Message-Id: <20190324230700.1956-1-kjlu@umn.edu>
Date:   Sun, 24 Mar 2019 18:06:59 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Samuel Ortiz <sameo@...ux.intel.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] nfc: fix a NULL pointer dereference

In case devm_kzalloc, the fix returns -ENOMEM to avoid the NULL
pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/nfc/st21nfca/se.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nfc/st21nfca/se.c b/drivers/nfc/st21nfca/se.c
index 4bed9e842db3..fd967a38a94a 100644
--- a/drivers/nfc/st21nfca/se.c
+++ b/drivers/nfc/st21nfca/se.c
@@ -328,6 +328,8 @@ int st21nfca_connectivity_event_received(struct nfc_hci_dev *hdev, u8 host,
 
 		transaction = (struct nfc_evt_transaction *)devm_kzalloc(dev,
 						   skb->len - 2, GFP_KERNEL);
+		if (!transaction)
+			return -ENOMEM;
 
 		transaction->aid_len = skb->data[1];
 		memcpy(transaction->aid, &skb->data[2],
-- 
2.17.1