[PATCH] media: dw2102: Fix use after free

From: Anton Vasilyev
Date: Thu Aug 22 2019 - 09:45:35 EST

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dvb_usb_device_init stores parts of properties at d->props
and d->desc and uses it on dvb_usb_device_exit.
Free of properties on module probe leads to use after free.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204597

The patch makes properties static instead of allocated on heap to prevent
memleak and use after free.
Also fixes s421_properties.devices initialization to have 2 element
instead of 6 copied from p7500_properties.

Signed-off-by: Anton Vasilyev <vasilyev@xxxxxxxxx>
Fixes: 299c7007e936 ("media: dw2102: Fix memleak on sequence of probes")
---
drivers/media/usb/dvb-usb/dw2102.c | 338 ++++++++++++++++++-----------
1 file changed, 215 insertions(+), 123 deletions(-)

diff --git a/drivers/media/usb/dvb-usb/dw2102.c b/drivers/media/usb/dvb-usb/dw2102.c
index b960abd00d48..7ea3aa0fee40 100644
--- a/drivers/media/usb/dvb-usb/dw2102.c
+++ b/drivers/media/usb/dvb-usb/dw2102.c
@@ -2098,46 +2098,153 @@ static struct dvb_usb_device_properties s6x0_properties = {
}
};

-static const struct dvb_usb_device_description d1100 = {
- "Prof 1100 USB ",
- {&dw2102_table[PROF_1100], NULL},
- {NULL},
-};
+static struct dvb_usb_device_properties p1100_properties = {
+ .caps = DVB_USB_IS_AN_I2C_ADAPTER,
+ .usb_ctrl = DEVICE_SPECIFIC,
+ .size_of_priv = sizeof(struct dw2102_state),
+ .firmware = P1100_FIRMWARE,
+ .no_reconnect = 1,

-static const struct dvb_usb_device_description d660 = {
- "TeVii S660 USB",
- {&dw2102_table[TEVII_S660], NULL},
- {NULL},
-};
+ .i2c_algo = &s6x0_i2c_algo,
+ .rc.core = {
+ .rc_interval = 150,
+ .rc_codes = RC_MAP_TBS_NEC,
+ .module_name = "dw2102",
+ .allowed_protos = RC_PROTO_BIT_NEC,
+ .rc_query = prof_rc_query,
+ },

-static const struct dvb_usb_device_description d480_1 = {
- "TeVii S480.1 USB",
- {&dw2102_table[TEVII_S480_1], NULL},
- {NULL},
+ .generic_bulk_ctrl_endpoint = 0x81,
+ .num_adapters = 1,
+ .download_firmware = dw2102_load_firmware,
+ .read_mac_address = s6x0_read_mac_address,
+ .adapter = {
+ {
+ .num_frontends = 1,
+ .fe = {{
+ .frontend_attach = stv0288_frontend_attach,
+ .stream = {
+ .type = USB_BULK,
+ .count = 8,
+ .endpoint = 0x82,
+ .u = {
+ .bulk = {
+ .buffersize = 4096,
+ }
+ }
+ },
+ } },
+ }
+ },
+ .num_device_descs = 1,
+ .devices = {
+ {"Prof 1100 USB ",
+ {&dw2102_table[PROF_1100], NULL},
+ {NULL},
+ },
+ }
};

-static const struct dvb_usb_device_description d480_2 = {
- "TeVii S480.2 USB",
- {&dw2102_table[TEVII_S480_2], NULL},
- {NULL},
-};
+static struct dvb_usb_device_properties s660_properties = {
+ .caps = DVB_USB_IS_AN_I2C_ADAPTER,
+ .usb_ctrl = DEVICE_SPECIFIC,
+ .size_of_priv = sizeof(struct dw2102_state),
+ .firmware = S660_FIRMWARE,
+ .no_reconnect = 1,

-static const struct dvb_usb_device_description d7500 = {
- "Prof 7500 USB DVB-S2",
- {&dw2102_table[PROF_7500], NULL},
- {NULL},
-};
+ .i2c_algo = &s6x0_i2c_algo,
+ .rc.core = {
+ .rc_interval = 150,
+ .rc_codes = RC_MAP_TEVII_NEC,
+ .module_name = "dw2102",
+ .allowed_protos = RC_PROTO_BIT_NEC,
+ .rc_query = dw2102_rc_query,
+ },

-static const struct dvb_usb_device_description d421 = {
- "TeVii S421 PCI",
- {&dw2102_table[TEVII_S421], NULL},
- {NULL},
+ .generic_bulk_ctrl_endpoint = 0x81,
+ .num_adapters = 1,
+ .download_firmware = dw2102_load_firmware,
+ .read_mac_address = s6x0_read_mac_address,
+ .adapter = {
+ {
+ .num_frontends = 1,
+ .fe = {{
+ .frontend_attach = ds3000_frontend_attach,
+ .stream = {
+ .type = USB_BULK,
+ .count = 8,
+ .endpoint = 0x82,
+ .u = {
+ .bulk = {
+ .buffersize = 4096,
+ }
+ }
+ },
+ } },
+ }
+ },
+ .num_device_descs = 3,
+ .devices = {
+ {"TeVii S660 USB",
+ {&dw2102_table[TEVII_S660], NULL},
+ {NULL},
+ },
+ {"TeVii S480.1 USB",
+ {&dw2102_table[TEVII_S480_1], NULL},
+ {NULL},
+ },
+ {"TeVii S480.2 USB",
+ {&dw2102_table[TEVII_S480_2], NULL},
+ {NULL},
+ },
+ }
};

-static const struct dvb_usb_device_description d632 = {
- "TeVii S632 USB",
- {&dw2102_table[TEVII_S632], NULL},
- {NULL},
+static struct dvb_usb_device_properties p7500_properties = {
+ .caps = DVB_USB_IS_AN_I2C_ADAPTER,
+ .usb_ctrl = DEVICE_SPECIFIC,
+ .size_of_priv = sizeof(struct dw2102_state),
+ .firmware = P7500_FIRMWARE,
+ .no_reconnect = 1,
+
+ .i2c_algo = &s6x0_i2c_algo,
+ .rc.core = {
+ .rc_interval = 150,
+ .rc_codes = RC_MAP_TBS_NEC,
+ .module_name = "dw2102",
+ .allowed_protos = RC_PROTO_BIT_NEC,
+ .rc_query = prof_rc_query,
+ },
+
+ .generic_bulk_ctrl_endpoint = 0x81,
+ .num_adapters = 1,
+ .download_firmware = dw2102_load_firmware,
+ .read_mac_address = s6x0_read_mac_address,
+ .adapter = {
+ {
+ .num_frontends = 1,
+ .fe = {{
+ .frontend_attach = prof_7500_frontend_attach,
+ .stream = {
+ .type = USB_BULK,
+ .count = 8,
+ .endpoint = 0x82,
+ .u = {
+ .bulk = {
+ .buffersize = 4096,
+ }
+ }
+ },
+ } },
+ }
+ },
+ .num_device_descs = 1,
+ .devices = {
+ {"Prof 7500 USB DVB-S2",
+ {&dw2102_table[PROF_7500], NULL},
+ {NULL},
+ },
+ }
};

static struct dvb_usb_device_properties su3000_properties = {
@@ -2209,6 +2316,59 @@ static struct dvb_usb_device_properties su3000_properties = {
}
};

+static struct dvb_usb_device_properties s421_properties = {
+ .caps = DVB_USB_IS_AN_I2C_ADAPTER,
+ .usb_ctrl = DEVICE_SPECIFIC,
+ .size_of_priv = sizeof(struct dw2102_state),
+ .power_ctrl = su3000_power_ctrl,
+ .num_adapters = 1,
+ .identify_state = su3000_identify_state,
+ .i2c_algo = &su3000_i2c_algo,
+
+ .rc.core = {
+ .rc_interval = 150,
+ .rc_codes = RC_MAP_SU3000,
+ .module_name = "dw2102",
+ .allowed_protos = RC_PROTO_BIT_RC5,
+ .rc_query = su3000_rc_query,
+ },
+
+ .read_mac_address = su3000_read_mac_address,
+
+ .generic_bulk_ctrl_endpoint = 0x01,
+
+ .adapter = {
+ {
+ .num_frontends = 1,
+ .fe = {{
+ .streaming_ctrl = su3000_streaming_ctrl,
+ .frontend_attach = m88rs2000_frontend_attach,
+ .stream = {
+ .type = USB_BULK,
+ .count = 8,
+ .endpoint = 0x82,
+ .u = {
+ .bulk = {
+ .buffersize = 4096,
+ }
+ }
+ }
+ } },
+ }
+ },
+ .num_device_descs = 2,
+ .devices = {
+ { "TeVii S421 PCI",
+ { &dw2102_table[TEVII_S421], NULL },
+ { NULL },
+ },
+ { "TeVii S632 USB",
+ { &dw2102_table[TEVII_S632], NULL },
+ { NULL },
+ },
+ }
+};
+
static struct dvb_usb_device_properties t220_properties = {
.caps = DVB_USB_IS_AN_I2C_ADAPTER,
.usb_ctrl = DEVICE_SPECIFIC,
@@ -2326,101 +2486,33 @@ static struct dvb_usb_device_properties tt_s2_4600_properties = {
static int dw2102_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
- int retval = -ENOMEM;
- struct dvb_usb_device_properties *p1100;
- struct dvb_usb_device_properties *s660;
- struct dvb_usb_device_properties *p7500;
- struct dvb_usb_device_properties *s421;
-
- p1100 = kmemdup(&s6x0_properties,
- sizeof(struct dvb_usb_device_properties), GFP_KERNEL);
- if (!p1100)
- goto err0;
-
- /* copy default structure */
- /* fill only different fields */
- p1100->firmware = P1100_FIRMWARE;
- p1100->devices[0] = d1100;
- p1100->rc.core.rc_query = prof_rc_query;
- p1100->rc.core.rc_codes = RC_MAP_TBS_NEC;
- p1100->adapter->fe[0].frontend_attach = stv0288_frontend_attach;
-
- s660 = kmemdup(&s6x0_properties,
- sizeof(struct dvb_usb_device_properties), GFP_KERNEL);
- if (!s660)
- goto err1;
-
- s660->firmware = S660_FIRMWARE;
- s660->num_device_descs = 3;
- s660->devices[0] = d660;
- s660->devices[1] = d480_1;
- s660->devices[2] = d480_2;
- s660->adapter->fe[0].frontend_attach = ds3000_frontend_attach;
-
- p7500 = kmemdup(&s6x0_properties,
- sizeof(struct dvb_usb_device_properties), GFP_KERNEL);
- if (!p7500)
- goto err2;
-
- p7500->firmware = P7500_FIRMWARE;
- p7500->devices[0] = d7500;
- p7500->rc.core.rc_query = prof_rc_query;
- p7500->rc.core.rc_codes = RC_MAP_TBS_NEC;
- p7500->adapter->fe[0].frontend_attach = prof_7500_frontend_attach;
-
-
- s421 = kmemdup(&su3000_properties,
- sizeof(struct dvb_usb_device_properties), GFP_KERNEL);
- if (!s421)
- goto err3;
-
- s421->num_device_descs = 2;
- s421->devices[0] = d421;
- s421->devices[1] = d632;
- s421->adapter->fe[0].frontend_attach = m88rs2000_frontend_attach;
-
- if (0 == dvb_usb_device_init(intf, &dw2102_properties,
- THIS_MODULE, NULL, adapter_nr) ||
- 0 == dvb_usb_device_init(intf, &dw2104_properties,
- THIS_MODULE, NULL, adapter_nr) ||
- 0 == dvb_usb_device_init(intf, &dw3101_properties,
- THIS_MODULE, NULL, adapter_nr) ||
- 0 == dvb_usb_device_init(intf, &s6x0_properties,
- THIS_MODULE, NULL, adapter_nr) ||
- 0 == dvb_usb_device_init(intf, p1100,
- THIS_MODULE, NULL, adapter_nr) ||
- 0 == dvb_usb_device_init(intf, s660,
- THIS_MODULE, NULL, adapter_nr) ||
- 0 == dvb_usb_device_init(intf, p7500,
- THIS_MODULE, NULL, adapter_nr) ||
- 0 == dvb_usb_device_init(intf, s421,
- THIS_MODULE, NULL, adapter_nr) ||
- 0 == dvb_usb_device_init(intf, &su3000_properties,
- THIS_MODULE, NULL, adapter_nr) ||
- 0 == dvb_usb_device_init(intf, &t220_properties,
- THIS_MODULE, NULL, adapter_nr) ||
- 0 == dvb_usb_device_init(intf, &tt_s2_4600_properties,
- THIS_MODULE, NULL, adapter_nr)) {
-
- /* clean up copied properties */
- kfree(s421);
- kfree(p7500);
- kfree(s660);
- kfree(p1100);
+ if (!(dvb_usb_device_init(intf, &dw2102_properties,
+ THIS_MODULE, NULL, adapter_nr) &&
+ dvb_usb_device_init(intf, &dw2104_properties,
+ THIS_MODULE, NULL, adapter_nr) &&
+ dvb_usb_device_init(intf, &dw3101_properties,
+ THIS_MODULE, NULL, adapter_nr) &&
+ dvb_usb_device_init(intf, &s6x0_properties,
+ THIS_MODULE, NULL, adapter_nr) &&
+ dvb_usb_device_init(intf, &p1100_properties,
+ THIS_MODULE, NULL, adapter_nr) &&
+ dvb_usb_device_init(intf, &s660_properties,
+ THIS_MODULE, NULL, adapter_nr) &&
+ dvb_usb_device_init(intf, &p7500_properties,
+ THIS_MODULE, NULL, adapter_nr) &&
+ dvb_usb_device_init(intf, &s421_properties,
+ THIS_MODULE, NULL, adapter_nr) &&
+ dvb_usb_device_init(intf, &su3000_properties,
+ THIS_MODULE, NULL, adapter_nr) &&
+ dvb_usb_device_init(intf, &t220_properties,
+ THIS_MODULE, NULL, adapter_nr) &&
+ dvb_usb_device_init(intf, &tt_s2_4600_properties,
+ THIS_MODULE, NULL, adapter_nr))) {

return 0;
}

- retval = -ENODEV;
- kfree(s421);
-err3:
- kfree(p7500);
-err2:
- kfree(s660);
-err1:
- kfree(p1100);
-err0:
- return retval;
+ return -ENODEV;
}

static void dw2102_disconnect(struct usb_interface *intf)
--
2.23.0

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