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Date: Sat, 20 Jul 2019 11:43:02 +0530
From: Vandana BN <bnvandana@...il.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
tskd08@...il.com
Cc: skhan@...uxfoundation.org, gregkh@...uxfoundation.org,
linux-kernel-mentees@...ts.linuxfoundation.org,
Vandana BN <bnvandana@...il.com>
Subject: [PATCH v2] media:dvb-frontends:Remove dvb_pll_devcount and id module parameters.
Syzbot reported global-out-of-bounds Read in dvb_pll_attach, while
accessing id[dvb_pll_devcount], because dvb_pll_devcount was 65,
that is more than size of 'id' which is DVB_PLL_MAX(64).
Fix would be to check if DVB_PLL_MAX devices are attached and if so return
NULL from dvb_pll_attach(). But this will put a limit on the number of
devices that can be attached.
Also dvb_pll_devcount and "id" module parameter are used for debugging
purpose to override/force PLL type.
So this patch removes these module parameters.
Reported-by: syz...@...kaller.appspotmail.com
usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the
software demuxer
dvbdev: DVB: registering new adapter (774 Friio White ISDB-T USB2.0)
usb 1-1: media controller created
dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
tc90522 0-0018: Toshiba TC90522 attached.
usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T
module)...
dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T
module' registered.
==================================================================
BUG: KASAN: global-out-of-bounds in dvb_pll_attach+0x6c5/0x830
drivers/media/dvb-frontends/dvb-pll.c:798
Read of size 4 at addr ffffffff89c9e5e0 by task kworker/0:1/12
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.2.0-rc6+ #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xca/0x13e lib/dump_stack.c:113
print_address_description+0x67/0x231 mm/kasan/report.c:188
__kasan_report.cold+0x1a/0x32 mm/kasan/report.c:317
kasan_report+0xe/0x20 mm/kasan/common.c:614
dvb_pll_attach+0x6c5/0x830 drivers/media/dvb-frontends/dvb-pll.c:798
dvb_pll_probe+0xfe/0x174 drivers/media/dvb-frontends/dvb-pll.c:877
i2c_device_probe+0x790/0xaa0 drivers/i2c/i2c-core-base.c:389
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
i2c_new_client_device+0x5b3/0xc40 drivers/i2c/i2c-core-base.c:778
i2c_new_device+0x19/0x50 drivers/i2c/i2c-core-base.c:821
dvb_module_probe+0xf9/0x220 drivers/media/dvb-core/dvbdev.c:985
friio_tuner_attach+0x125/0x1d0 drivers/media/usb/dvb-usb-v2/gl861.c:536
dvb_usbv2_adapter_frontend_init
drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:675 [inline]
dvb_usbv2_adapter_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:804
[inline]
dvb_usbv2_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:865 [inline]
dvb_usbv2_probe.cold+0x24dc/0x255d
drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:980
usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_new_device.cold+0x8c1/0x1016 drivers/usb/core/hub.c:2534
hub_port_connect drivers/usb/core/hub.c:5089 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
port_event drivers/usb/core/hub.c:5350 [inline]
hub_event+0x1ada/0x3590 drivers/usb/core/hub.c:5432
process_one_work+0x905/0x1570 kernel/workqueue.c:2269
process_scheduled_works kernel/workqueue.c:2331 [inline]
worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
kthread+0x30b/0x410 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
The buggy address belongs to the variable:
id+0x100/0x120
Memory state around the buggy address:
ffffffff89c9e480: fa fa fa fa 00 00 fa fa fa fa fa fa 00 00 00 00
ffffffff89c9e500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffffffff89c9e580: 00 00 00 00 00 00 00 00 00 00 00 00 fa fa fa fa
^
ffffffff89c9e600: 04 fa fa fa fa fa fa fa 04 fa fa fa fa fa fa fa
ffffffff89c9e680: 04 fa fa fa fa fa fa fa 04 fa fa fa fa fa fa fa
==================================================================
Signed-off-by: Vandana BN <bnvandana@...il.com>
---
drivers/media/dvb-frontends/dvb-pll.c | 19 +++----------------
1 file changed, 3 insertions(+), 16 deletions(-)
diff --git a/drivers/media/dvb-frontends/dvb-pll.c b/drivers/media/dvb-frontends/dvb-pll.c
index ba0c49107bd2..c3a04751e9cf 100644
--- a/drivers/media/dvb-frontends/dvb-pll.c
+++ b/drivers/media/dvb-frontends/dvb-pll.c
@@ -33,19 +33,11 @@ struct dvb_pll_priv {
u32 bandwidth;
};
-#define DVB_PLL_MAX 64
-
-static unsigned int dvb_pll_devcount;
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable verbose debug messages");
-static unsigned int id[DVB_PLL_MAX] =
- { [ 0 ... (DVB_PLL_MAX-1) ] = DVB_PLL_UNDEFINED };
-module_param_array(id, int, NULL, 0644);
-MODULE_PARM_DESC(id, "force pll id to use (DEBUG ONLY)");
-
/* ----------------------------------------------------------- */
struct dvb_pll_desc {
@@ -795,10 +787,6 @@ struct dvb_frontend *dvb_pll_attach(struct dvb_frontend *fe, int pll_addr,
b1[0] = 0;
msg.buf = b1;
- if ((id[dvb_pll_devcount] > DVB_PLL_UNDEFINED) &&
- (id[dvb_pll_devcount] < ARRAY_SIZE(pll_list)))
- pll_desc_id = id[dvb_pll_devcount];
-
BUG_ON(pll_desc_id < 1 || pll_desc_id >= ARRAY_SIZE(pll_list));
desc = pll_list[pll_desc_id];
@@ -825,7 +813,7 @@ struct dvb_frontend *dvb_pll_attach(struct dvb_frontend *fe, int pll_addr,
priv->pll_i2c_address = pll_addr;
priv->i2c = i2c;
priv->pll_desc = desc;
- priv->nr = dvb_pll_devcount++;
+ priv->nr = pll_desc_id;
memcpy(&fe->ops.tuner_ops, &dvb_pll_tuner_ops,
sizeof(struct dvb_tuner_ops));
@@ -846,13 +834,12 @@ struct dvb_frontend *dvb_pll_attach(struct dvb_frontend *fe, int pll_addr,
fe->tuner_priv = priv;
- if ((debug) || (id[priv->nr] == pll_desc_id)) {
+ if (debug) {
dprintk("dvb-pll[%d]", priv->nr);
if (i2c != NULL)
pr_cont(" %d-%04x", i2c_adapter_id(i2c), pll_addr);
pr_cont(": id# %d (%s) attached, %s\n", pll_desc_id, desc->name,
- id[priv->nr] == pll_desc_id ?
- "insmod option" : "autodetected");
+ "insmod option");
}
kfree(b1);
--
2.17.1
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