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[76.176.3.80]) by smtp.gmail.com with ESMTPSA id j9sm99456381pfi.86.2019.01.10.22.55.19 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 10 Jan 2019 22:55:20 -0800 (PST) Date: Thu, 10 Jan 2019 22:55:17 -0800 From: Myungho Jung To: Marcel Holtmann , Johan Hedberg Cc: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] Bluetooth: hci_uart: Add a local variable to store the result of h4_recv_buf() Message-ID: <20190111065514.GA26542@myunghoj-Precision-5530> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org In h4_recv(), if h4_recv_buf() returns error and h4_recv() is asynchronously called again before setting rx_skb to NULL, ERR_PTR will be dereferenced in h4_recv_buf(). Check return value in a local variable before writing to rx_skb. Reported-by: syzbot+017a32f149406df32703@syzkaller.appspotmail.com Signed-off-by: Myungho Jung --- drivers/bluetooth/hci_h4.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/bluetooth/hci_h4.c b/drivers/bluetooth/hci_h4.c index fb97a3bf069b..fa30ec9cebd4 100644 --- a/drivers/bluetooth/hci_h4.c +++ b/drivers/bluetooth/hci_h4.c @@ -124,19 +124,22 @@ static const struct h4_recv_pkt h4_recv_pkts[] = { static int h4_recv(struct hci_uart *hu, const void *data, int count) { struct h4_struct *h4 = hu->priv; + struct sk_buff *skb; if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) return -EUNATCH; - h4->rx_skb = h4_recv_buf(hu->hdev, h4->rx_skb, data, count, - h4_recv_pkts, ARRAY_SIZE(h4_recv_pkts)); - if (IS_ERR(h4->rx_skb)) { - int err = PTR_ERR(h4->rx_skb); + skb = h4_recv_buf(hu->hdev, h4->rx_skb, data, count, + h4_recv_pkts, ARRAY_SIZE(h4_recv_pkts)); + if (IS_ERR(skb)) { + int err = PTR_ERR(skb); bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); h4->rx_skb = NULL; return err; } + h4->rx_skb = skb; + return count; } -- 2.17.1