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media: dw2102: Fix memleak on sequence of probes 

Each call to dw2102_probe() allocates memory by kmemdup for structures
p1100, s660, p7500 and s421, but there is no their deallocation.
dvb_usb_device_init() copies the corresponding structure into
dvb_usb_device->props, so there is no use of original structure after
dvb_usb_device_init().

The patch moves structures from global scope to local and adds their
deallocation.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Anton Vasilyev 2018-07-23 13:04:54 -04:00 committed by Mauro Carvalho Chehab
parent 1b7369acc4
commit 299c7007e9
1 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/media/usb/dvb-usb/dw2102.c
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@ -2101,14 +2101,12 @@ static struct dvb_usb_device_properties s6x0_properties = {
}
};
static struct dvb_usb_device_properties *p1100;
static const struct dvb_usb_device_description d1100 = {
"Prof 1100 USB ",
{&dw2102_table[PROF_1100], NULL},
{NULL},
};
static struct dvb_usb_device_properties *s660;
static const struct dvb_usb_device_description d660 = {
"TeVii S660 USB",
{&dw2102_table[TEVII_S660], NULL},
@ -2127,14 +2125,12 @@ static const struct dvb_usb_device_description d480_2 = {
{NULL},
};
static struct dvb_usb_device_properties *p7500;
static const struct dvb_usb_device_description d7500 = {
"Prof 7500 USB DVB-S2",
{&dw2102_table[PROF_7500], NULL},
{NULL},
};
static struct dvb_usb_device_properties *s421;
static const struct dvb_usb_device_description d421 = {
"TeVii S421 PCI",
{&dw2102_table[TEVII_S421], NULL},
@ -2334,6 +2330,11 @@ 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)
@ -2402,8 +2403,16 @@ static int dw2102_probe(struct usb_interface *intf,
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))
THIS_MODULE, NULL, adapter_nr)) {
/* clean up copied properties */
kfree(s421);
kfree(p7500);
kfree(s660);
kfree(p1100);
return 0;
}
retval = -ENODEV;
kfree(s421);