linux-kernel - Re: usb/media/em28xx: use-after-free in em28xx_dvb

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Date:   Tue, 7 Nov 2017 15:18:50 -0600
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: Re: usb/media/em28xx: use-after-free in em28xx_dvb_fini

Hi Andrey,

Could you please try this patch?

Thank you

Gustavo A. R. Silva

---
 drivers/media/usb/em28xx/em28xx-dvb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/usb/em28xx/em28xx-dvb.c b/drivers/media/usb/em28xx/em28xx-dvb.c
index 4a7db62..fc3fb92 100644
--- a/drivers/media/usb/em28xx/em28xx-dvb.c
+++ b/drivers/media/usb/em28xx/em28xx-dvb.c
@@ -2073,6 +2073,9 @@ static int em28xx_dvb_fini(struct em28xx *dev)
 	struct em28xx_dvb *dvb;
 	struct i2c_client *client;
 
+	if (!dev)
+		return 0;
+
 	if (dev->is_audio_only) {
 		/* Shouldn't initialize IR for this interface */
 		return 0;
-- 
2.7.4