linux-kernel - [PATCH] tty: ipwireless: fix potential NULL pointer dereference

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Message-ID: <20170605205002.GA4896@embeddedgus>
Date:   Mon, 5 Jun 2017 15:50:02 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Jiri Kosina <jikos@...nel.org>, David Sterba <dsterba@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>
Cc:     linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] tty: ipwireless: fix potential NULL pointer dereference

Add null check before dereferencing pointer ver_packet.
Print error message and exit in case pointer ver_packet
is NULL.

Addresses-Coverity-ID: 1362295
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/tty/ipwireless/hardware.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/tty/ipwireless/hardware.c b/drivers/tty/ipwireless/hardware.c
index df0204b..20db99d 100644
--- a/drivers/tty/ipwireless/hardware.c
+++ b/drivers/tty/ipwireless/hardware.c
@@ -1515,6 +1515,13 @@ static void ipw_send_setup_packet(struct ipw_hardware *hw)
 			sizeof(struct ipw_setup_get_version_query_packet),
 			ADDR_SETUP_PROT, TL_PROTOCOLID_SETUP,
 			TL_SETUP_SIGNO_GET_VERSION_QRY);
+
+	if (!ver_packet) {
+		pr_err(IPWIRELESS_PCCARD_NAME
+		       ": Not enough memory to send packet\n");
+		return;
+	}
+
 	ver_packet->header.length = sizeof(struct tl_setup_get_version_qry);
 
 	/*
-- 
2.5.0