linux-kernel - [PATCH] staging: rtl8192u: add error handling for usb_alloc

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Date:   Mon, 11 Jun 2018 16:31:11 +0800
From:   Zhouyang Jia <jiazhouyang09@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Zhouyang Jia <jiazhouyang09@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Colin Ian King <colin.king@...onical.com>,
        Shreeya Patel <shreeya.patel23498@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Jia-Ju Bai <baijiaju1990@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: rtl8192u: add error handling for usb_alloc_urb

When usb_alloc_urb fails, the lack of error-handling code may
cause unexpected results.

This patch adds error-handling code after calling usb_alloc_urb.

Signed-off-by: Zhouyang Jia <jiazhouyang09@...il.com>
---
 drivers/staging/rtl8192u/r8192U_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
index 7a0dbc0..3f09615 100644
--- a/drivers/staging/rtl8192u/r8192U_core.c
+++ b/drivers/staging/rtl8192u/r8192U_core.c
@@ -1666,6 +1666,9 @@ static short rtl8192_usb_initendpoints(struct net_device *dev)
 		void *oldaddr, *newaddr;
 
 		priv->rx_urb[16] = usb_alloc_urb(0, GFP_KERNEL);
+		if (!priv->rx_urb[16])
+			return -ENOMEM;
+
 		priv->oldaddr = kmalloc(16, GFP_KERNEL);
 		if (!priv->oldaddr)
 			return -ENOMEM;
-- 
2.7.4