linux-kernel - [PATCH] usbtv: correctly handling failed allocation

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Message-Id: <1451425709-30624-1-git-send-email-wuninsu@gmail.com>
Date:	Tue, 29 Dec 2015 16:48:29 -0500
From:	Insu Yun <wuninsu@...il.com>
To:	mchehab@....samsung.com, hverkuil@...all.nl, inki.dae@...sung.com,
	jh1009.sung@...sung.com, sw0312.kim@...sung.com,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	taesoo@...ech.edu, yeongjin.jang@...ech.edu, insu@...ech.edu,
	changwoo@...ech.edu, Insu Yun <wuninsu@...il.com>
Subject: [PATCH] usbtv: correctly handling failed allocation

Since kzalloc can be failed, 
if not properly handled, NULL dereference could be happened.

Signed-off-by: Insu Yun <wuninsu@...il.com>
---
 drivers/media/usb/usbtv/usbtv-video.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/usb/usbtv/usbtv-video.c b/drivers/media/usb/usbtv/usbtv-video.c
index e645c9d..92d8d7a 100644
--- a/drivers/media/usb/usbtv/usbtv-video.c
+++ b/drivers/media/usb/usbtv/usbtv-video.c
@@ -389,6 +389,10 @@ static struct urb *usbtv_setup_iso_transfer(struct usbtv *usbtv)
 	ip->transfer_flags = URB_ISO_ASAP;
 	ip->transfer_buffer = kzalloc(size * USBTV_ISOC_PACKETS,
 						GFP_KERNEL);
+	if (!ip->transfer_buffer) {
+		usb_free_urb(ip);
+		return NULL;
+	}
 	ip->complete = usbtv_iso_cb;
 	ip->number_of_packets = USBTV_ISOC_PACKETS;
 	ip->transfer_buffer_length = size * USBTV_ISOC_PACKETS;
-- 
1.9.1

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