linux-kernel - [PATCH] rtl8192_init_priv_variable: null check is missing for kzalloc

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Date:   Sat, 20 Jul 2019 15:25:44 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     kjlu@....edu, smccaman@....edu, secalert@...hat.com,
        emamd001@....edu, Navid Emamdoost <navid.emamdoost@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        John Whitmore <johnfwhitmore@...il.com>,
        Nishka Dasgupta <nishkadg.linux@...il.com>,
        Colin Ian King <colin.king@...onical.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] rtl8192_init_priv_variable: null check is missing for kzalloc

Allocation for priv->pFirmware may fail, so a null check is necessary.
priv->pFirmware is accessed at line 2743. I added the check and made
appropriate changes to propagate the errno to the caller.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 drivers/staging/rtl8192u/r8192U_core.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
index fe1f279ca368..5fb24b13ce5b 100644
--- a/drivers/staging/rtl8192u/r8192U_core.c
+++ b/drivers/staging/rtl8192u/r8192U_core.c
@@ -2096,7 +2096,7 @@ static void rtl8192_SetWirelessMode(struct net_device *dev, u8 wireless_mode)
 }
 
 /* init priv variables here. only non_zero value should be initialized here. */
-static void rtl8192_init_priv_variable(struct net_device *dev)
+static int rtl8192_init_priv_variable(struct net_device *dev)
 {
 	struct r8192_priv *priv = ieee80211_priv(dev);
 	u8 i;
@@ -2223,6 +2223,10 @@ static void rtl8192_init_priv_variable(struct net_device *dev)
 
 	priv->AcmControl = 0;
 	priv->pFirmware = kzalloc(sizeof(rt_firmware), GFP_KERNEL);
+	if (!priv->pFirmware) {
+		return -ENOMEM;
+	}
+
 
 	/* rx related queue */
 	skb_queue_head_init(&priv->rx_queue);
@@ -2236,6 +2240,8 @@ static void rtl8192_init_priv_variable(struct net_device *dev)
 	for (i = 0; i < MAX_QUEUE_SIZE; i++)
 		skb_queue_head_init(&priv->ieee80211->skb_drv_aggQ[i]);
 	priv->rf_set_chan = rtl8192_phy_SwChnl;
+
+	return 0;
 }
 
 /* init lock here */
@@ -2605,7 +2611,10 @@ static short rtl8192_init(struct net_device *dev)
 		memcpy(priv->txqueue_to_outpipemap, queuetopipe, 9);
 	}
 #endif
-	rtl8192_init_priv_variable(dev);
+	err = rtl8192_init_priv_variable(dev);
+	if (err) {
+		return err;
+	}
 	rtl8192_init_priv_lock(priv);
 	rtl8192_init_priv_task(dev);
 	rtl8192_get_eeprom_size(dev);
-- 
2.17.1