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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Oliver Neukum <oneukum@suse.com>,
	syzbot+26ec41e9f788b3eba396@syzkaller.appspotmail.com,
	Sean Young <sean@mess.org>,
	Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
	Sasha Levin <sashal@kernel.org>,
	linux-media@vger.kernel.org
Subject: [PATCH AUTOSEL 5.1 019/219] media: dvb: usb: fix use after free in dvb_usb_device_exit
Date: Mon, 15 Jul 2019 10:00:20 -0400	[thread overview]
Message-ID: <20190715140341.6443-19-sashal@kernel.org> (raw)
In-Reply-To: <20190715140341.6443-1-sashal@kernel.org>

From: Oliver Neukum <oneukum@suse.com>

[ Upstream commit 6cf97230cd5f36b7665099083272595c55d72be7 ]

dvb_usb_device_exit() frees and uses the device name in that order.
Fix by storing the name in a buffer before freeing it.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Reported-by: syzbot+26ec41e9f788b3eba396@syzkaller.appspotmail.com
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/media/usb/dvb-usb/dvb-usb-init.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/dvb-usb/dvb-usb-init.c b/drivers/media/usb/dvb-usb/dvb-usb-init.c
index 99951e02a880..dd063a736df5 100644
--- a/drivers/media/usb/dvb-usb/dvb-usb-init.c
+++ b/drivers/media/usb/dvb-usb/dvb-usb-init.c
@@ -287,12 +287,15 @@ EXPORT_SYMBOL(dvb_usb_device_init);
 void dvb_usb_device_exit(struct usb_interface *intf)
 {
 	struct dvb_usb_device *d = usb_get_intfdata(intf);
-	const char *name = "generic DVB-USB module";
+	const char *default_name = "generic DVB-USB module";
+	char name[40];
 
 	usb_set_intfdata(intf, NULL);
 	if (d != NULL && d->desc != NULL) {
-		name = d->desc->name;
+		strscpy(name, d->desc->name, sizeof(name));
 		dvb_usb_exit(d);
+	} else {
+		strscpy(name, default_name, sizeof(name));
 	}
 	info("%s successfully deinitialized and disconnected.", name);
 
-- 
2.20.1


       reply	other threads:[~2019-07-15 14:05 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190715140341.6443-1-sashal@kernel.org>
2019-07-15 14:00 ` Sasha Levin [this message]
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 020/219] media: spi: IR LED: add missing of table registration Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 022/219] media: ov7740: avoid invalid framesize setting Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 023/219] media: marvell-ccic: fix DMA s/g desc number calculation Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 024/219] media: vpss: fix a potential NULL pointer dereference Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 025/219] media: media_device_enum_links32: clean a reserved field Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 026/219] media: venus: firmware: fix leaked of_node references Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 037/219] media: vim2m: fix two double-free issues Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 038/219] media: v4l2-core: fix use-after-free error Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 040/219] media: usb:zr364xx:Fix KASAN:null-ptr-deref Read in zr364xx_vidioc_querycap Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 044/219] media: mc-device.c: don't memset __user pointer contents Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 045/219] media: saa7164: fix remove_proc_entry warning Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 046/219] media: staging: media: davinci_vpfe: - Fix for memory leak if decoder initialization fails Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 050/219] tua6100: Avoid build warnings Sasha Levin
2019-07-15 14:00 ` [PATCH AUTOSEL 5.1 054/219] media: wl128x: Fix some error handling in fm_v4l2_init_video_device() Sasha Levin
2019-07-15 14:01 ` [PATCH AUTOSEL 5.1 059/219] media: imx7-mipi-csis: Propagate the error if clock enabling fails Sasha Levin
2019-07-15 14:01 ` [PATCH AUTOSEL 5.1 061/219] media: aspeed: change irq to threaded irq Sasha Levin
2019-07-15 14:01 ` [PATCH AUTOSEL 5.1 075/219] media: uvcvideo: Fix access to uninitialized fields on probe error Sasha Levin
2019-07-15 14:01 ` [PATCH AUTOSEL 5.1 076/219] media: fdp1: Support M3N and E3 platforms Sasha Levin
2019-07-15 14:01 ` [PATCH AUTOSEL 5.1 082/219] media: davinci: vpif_capture: fix memory leak in vpif_probe() Sasha Levin
2019-07-15 14:01 ` [PATCH AUTOSEL 5.1 084/219] media: s5p-mfc: fix reading min scratch buffer size on MFC v6/v7 Sasha Levin
2019-07-15 14:02 ` [PATCH AUTOSEL 5.1 126/219] media: s5p-mfc: Make additional clocks optional Sasha Levin
2019-07-15 14:02 ` [PATCH AUTOSEL 5.1 127/219] media: i2c: fix warning same module names Sasha Levin
2019-07-15 14:02 ` [PATCH AUTOSEL 5.1 130/219] media: mt9m111: fix fw-node refactoring Sasha Levin
2019-07-15 14:02 ` [PATCH AUTOSEL 5.1 133/219] media: coda: fix mpeg2 sequence number handling Sasha Levin
2019-07-15 14:02 ` [PATCH AUTOSEL 5.1 134/219] media: coda: fix last buffer handling in V4L2_ENC_CMD_STOP Sasha Levin
2019-07-15 14:02 ` [PATCH AUTOSEL 5.1 135/219] media: coda: increment sequence offset for the last returned frame Sasha Levin
2019-07-15 14:02 ` [PATCH AUTOSEL 5.1 136/219] media: vimc: cap: check v4l2_fill_pixfmt return value Sasha Levin
2019-07-15 14:02 ` [PATCH AUTOSEL 5.1 137/219] media: hdpvr: fix locking and a missing msleep Sasha Levin
     [not found] <20190715133811.2441-1-sashal@kernel.org>
2019-07-15 13:34 ` [PATCH AUTOSEL 5.1 019/219] media: dvb: usb: fix use after free in dvb_usb_device_exit Sasha Levin

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