linux-kernel - [PATCH net] nfc: fix potential illegal memory access

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Message-Id: <1562506660-15853-1-git-send-email-albin_yang@163.com>
Date:   Sun,  7 Jul 2019 21:37:40 +0800
From:   Yang Wei <albin_yang@....com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     davem@...emloft.net, tglx@...utronix.de, albin_yang@....com
Subject: [PATCH net] nfc: fix potential illegal memory access

The frags_q is used before __skb_queue_head_init when conn_info is
NULL. It may result in illegal memory access.

Signed-off-by: Yang Wei <albin_yang@....com>
---
 net/nfc/nci/data.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/nfc/nci/data.c b/net/nfc/nci/data.c
index 0a0c265..b5f16cb 100644
--- a/net/nfc/nci/data.c
+++ b/net/nfc/nci/data.c
@@ -104,14 +104,14 @@ static int nci_queue_tx_data_frags(struct nci_dev *ndev,
 
 	pr_debug("conn_id 0x%x, total_len %d\n", conn_id, total_len);
 
+	__skb_queue_head_init(&frags_q);
+
 	conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
 	if (!conn_info) {
 		rc = -EPROTO;
 		goto free_exit;
 	}
 
-	__skb_queue_head_init(&frags_q);
-
 	while (total_len) {
 		frag_len =
 			min_t(int, total_len, conn_info->max_pkt_payload_len);
-- 
2.7.4