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Message-Id: <20250906152420.141374-1-aha310510@gmail.com>
Date: Sun, 7 Sep 2025 00:24:20 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+0192952caa411a3be209@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com,
aha310510@...il.com
Subject: Re: [syzbot] [media?] BUG: corrupted list in az6007_i2c_xfer
#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
---
drivers/media/usb/dvb-usb-v2/az6007.c | 184 ++++++++++++++------------
1 file changed, 103 insertions(+), 81 deletions(-)
diff --git a/drivers/media/usb/dvb-usb-v2/az6007.c b/drivers/media/usb/dvb-usb-v2/az6007.c
index 65ef045b74ca..69489cd3a0c4 100644
--- a/drivers/media/usb/dvb-usb-v2/az6007.c
+++ b/drivers/media/usb/dvb-usb-v2/az6007.c
@@ -43,6 +43,7 @@ struct az6007_device_state {
struct mutex ca_mutex;
struct dvb_ca_en50221 ca;
unsigned warm:1;
+ unsigned ci_attached:1;
int (*gate_ctrl) (struct dvb_frontend *, int);
unsigned char data[4096];
};
@@ -97,19 +98,30 @@ static struct mt2063_config az6007_mt2063_config = {
.refclock = 36125000,
};
-static int __az6007_read(struct usb_device *udev, u8 req, u16 value,
- u16 index, u8 *b, int blen)
+static int __az6007_read(struct dvb_usb_device *d, struct az6007_device_state *st,
+ u8 req, u16 value, u16 index, u8 *b, int blen)
{
int ret;
- ret = usb_control_msg(udev,
- usb_rcvctrlpipe(udev, 0),
+ if (mutex_lock_interruptible(&d->usb_mutex) < 0)
+ return -EAGAIN;
+
+ if (blen > sizeof(st->data)) {
+ pr_err("az6007: tried to read %d bytes, but I2C max size is %lu bytes\n",
+ blen, sizeof(st->data));
+ ret = -EOPNOTSUPP;
+ goto end_unlock;
+ }
+
+ ret = usb_control_msg(d->udev,
+ usb_rcvctrlpipe(d->udev, 0),
req,
USB_TYPE_VENDOR | USB_DIR_IN,
value, index, b, blen, 5000);
if (ret < 0) {
pr_warn("usb read operation failed. (%d)\n", ret);
- return -EIO;
+ ret = -EIO;
+ goto end_unlock;
}
if (az6007_xfer_debug) {
@@ -119,30 +131,42 @@ static int __az6007_read(struct usb_device *udev, u8 req, u16 value,
DUMP_PREFIX_NONE, b, blen);
}
+end_unlock:
+ mutex_unlock(&d->usb_mutex);
return ret;
}
static int az6007_read(struct dvb_usb_device *d, u8 req, u16 value,
u16 index, u8 *b, int blen)
{
- struct az6007_device_state *st = d->priv;
+ struct az6007_device_state *st = d_to_priv(d);
int ret;
if (mutex_lock_interruptible(&st->mutex) < 0)
return -EAGAIN;
- ret = __az6007_read(d->udev, req, value, index, b, blen);
+ ret = __az6007_read(d, st, req, value, index, b, blen);
mutex_unlock(&st->mutex);
return ret;
}
-static int __az6007_write(struct usb_device *udev, u8 req, u16 value,
- u16 index, u8 *b, int blen)
+static int __az6007_write(struct dvb_usb_device *d, struct az6007_device_state *st,
+ u8 req, u16 value, u16 index, u8 *b, int blen)
{
int ret;
+ if (mutex_lock_interruptible(&d->usb_mutex) < 0)
+ return -EAGAIN;
+
+ if (blen > sizeof(st->data) - 1) {
+ pr_err("az6007: tried to write %d bytes, but I2C max size is %lu bytes\n",
+ blen, sizeof(st->data));
+ ret = -EOPNOTSUPP;
+ goto end_unlock;
+ }
+
if (az6007_xfer_debug) {
printk(KERN_DEBUG "az6007: OUT req: %02x, value: %04x, index: %04x\n",
req, value, index);
@@ -150,35 +174,33 @@ static int __az6007_write(struct usb_device *udev, u8 req, u16 value,
DUMP_PREFIX_NONE, b, blen);
}
- if (blen > 64) {
- pr_err("az6007: tried to write %d bytes, but I2C max size is 64 bytes\n",
- blen);
- return -EOPNOTSUPP;
- }
-
- ret = usb_control_msg(udev,
- usb_sndctrlpipe(udev, 0),
+ ret = usb_control_msg(d->udev,
+ usb_sndctrlpipe(d->udev, 0),
req,
USB_TYPE_VENDOR | USB_DIR_OUT,
value, index, b, blen, 5000);
if (ret != blen) {
pr_err("usb write operation failed. (%d)\n", ret);
- return -EIO;
+ ret = -EIO;
+ goto end_unlock;
}
- return 0;
+ ret = 0;
+end_unlock:
+ mutex_unlock(&d->usb_mutex);
+ return ret;
}
static int az6007_write(struct dvb_usb_device *d, u8 req, u16 value,
u16 index, u8 *b, int blen)
{
- struct az6007_device_state *st = d->priv;
+ struct az6007_device_state *st = d_to_priv(d);
int ret;
if (mutex_lock_interruptible(&st->mutex) < 0)
return -EAGAIN;
- ret = __az6007_write(d->udev, req, value, index, b, blen);
+ ret = __az6007_write(d, st, req, value, index, b, blen);
mutex_unlock(&st->mutex);
@@ -574,10 +596,9 @@ static void az6007_ci_uninit(struct dvb_usb_device *d)
}
-static int az6007_ci_init(struct dvb_usb_adapter *adap)
+static int az6007_ci_init(struct dvb_usb_device *d)
{
- struct dvb_usb_device *d = adap_to_d(adap);
- struct az6007_device_state *state = adap_to_priv(adap);
+ struct az6007_device_state *state = d_to_priv(d);
int ret;
pr_debug("%s()\n", __func__);
@@ -594,7 +615,7 @@ static int az6007_ci_init(struct dvb_usb_adapter *adap)
state->ca.poll_slot_status = az6007_ci_poll_slot_status;
state->ca.data = d;
- ret = dvb_ca_en50221_init(&adap->dvb_adap,
+ ret = dvb_ca_en50221_init(&d->adapter[0].dvb_adap,
&state->ca,
0, /* flags */
1);/* n_slots */
@@ -604,6 +625,8 @@ static int az6007_ci_init(struct dvb_usb_adapter *adap)
return ret;
}
+ state->ci_attached = true;
+
pr_debug("CI initialized.\n");
return 0;
@@ -640,8 +663,6 @@ static int az6007_frontend_attach(struct dvb_usb_adapter *adap)
st->gate_ctrl = adap->fe[0]->ops.i2c_gate_ctrl;
adap->fe[0]->ops.i2c_gate_ctrl = drxk_gate_ctrl;
- az6007_ci_init(adap);
-
return 0;
}
@@ -661,8 +682,6 @@ static int az6007_cablestar_hdci_frontend_attach(struct dvb_usb_adapter *adap)
st->gate_ctrl = adap->fe[0]->ops.i2c_gate_ctrl;
adap->fe[0]->ops.i2c_gate_ctrl = drxk_gate_ctrl;
- az6007_ci_init(adap);
-
return 0;
}
@@ -752,8 +771,13 @@ static int az6007_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
int length;
u8 req, addr;
- if (mutex_lock_interruptible(&st->mutex) < 0)
+ if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
+ return -EAGAIN;
+ if (mutex_lock_interruptible(&st->mutex) < 0) {
+ mutex_unlock(&d->i2c_mutex);
return -EAGAIN;
+ }
+ printk(KERN_INFO "az6007_i2c_xfer 1 : %lx", atomic_long_read(&st->mutex.owner));
for (i = 0; i < num; i++) {
addr = msgs[i].addr << 1;
@@ -775,13 +799,14 @@ static int az6007_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
value = addr | (1 << 8);
length = 6 + msgs[i + 1].len;
len = msgs[i + 1].len;
- ret = __az6007_read(d->udev, req, value, index,
+ printk(KERN_INFO "az6007_i2c_xfer 2 : %lx", atomic_long_read(&st->mutex.owner));
+ ret = __az6007_read(d, st, req, value, index,
st->data, length);
- if (ret >= len) {
+ printk(KERN_INFO "az6007_i2c_xfer 3 : %lx", atomic_long_read(&st->mutex.owner));
+ if (ret >= len + 5) {
for (j = 0; j < len; j++)
msgs[i + 1].buf[j] = st->data[j + 5];
- } else
- ret = -EIO;
+ }
i++;
} else if (!(msgs[i].flags & I2C_M_RD)) {
/* write bytes */
@@ -797,10 +822,10 @@ static int az6007_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
value = addr | (1 << 8);
length = msgs[i].len - 1;
len = msgs[i].len - 1;
- for (j = 0; j < len; j++)
- st->data[j] = msgs[i].buf[j + 1];
- ret = __az6007_write(d->udev, req, value, index,
- st->data, length);
+ printk(KERN_INFO "az6007_i2c_xfer 4 : %lx", atomic_long_read(&st->mutex.owner));
+ ret = __az6007_write(d, st, req, value, index,
+ &msgs[i].buf[1], length);
+ printk(KERN_INFO "az6007_i2c_xfer 5 : %lx", atomic_long_read(&st->mutex.owner));
} else {
/* read bytes */
if (az6007_xfer_debug)
@@ -815,16 +840,22 @@ static int az6007_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
value = addr;
length = msgs[i].len + 6;
len = msgs[i].len;
- ret = __az6007_read(d->udev, req, value, index,
+ printk(KERN_INFO "az6007_i2c_xfer 6 : %lx", atomic_long_read(&st->mutex.owner));
+ ret = __az6007_read(d, st, req, value, index,
st->data, length);
- for (j = 0; j < len; j++)
- msgs[i].buf[j] = st->data[j + 5];
+ printk(KERN_INFO "az6007_i2c_xfer 7 : %lx", atomic_long_read(&st->mutex.owner));
+ if (ret >= len + 5) {
+ for (j = 0; j < len; j++)
+ msgs[i].buf[j] = st->data[j + 5];
+ }
}
if (ret < 0)
goto err;
}
err:
+ printk(KERN_INFO "az6007_i2c_xfer 8 : %lx", atomic_long_read(&st->mutex.owner));
mutex_unlock(&st->mutex);
+ mutex_unlock(&d->i2c_mutex);
if (ret < 0) {
pr_info("%s ERROR: %i\n", __func__, ret);
@@ -845,6 +876,7 @@ static const struct i2c_algorithm az6007_i2c_algo = {
static int az6007_identify_state(struct dvb_usb_device *d, const char **name)
{
+ struct az6007_device_state *state = d_to_priv(d);
int ret;
u8 *mac;
@@ -855,7 +887,7 @@ static int az6007_identify_state(struct dvb_usb_device *d, const char **name)
return -ENOMEM;
/* Try to read the mac address */
- ret = __az6007_read(d->udev, AZ6007_READ_DATA, 6, 0, mac, 6);
+ ret = __az6007_read(d, state, AZ6007_READ_DATA, 6, 0, mac, 6);
if (ret == 6)
ret = WARM;
else
@@ -864,9 +896,9 @@ static int az6007_identify_state(struct dvb_usb_device *d, const char **name)
kfree(mac);
if (ret == COLD) {
- __az6007_write(d->udev, 0x09, 1, 0, NULL, 0);
- __az6007_write(d->udev, 0x00, 0, 0, NULL, 0);
- __az6007_write(d->udev, 0x00, 0, 0, NULL, 0);
+ __az6007_write(d, state, 0x09, 1, 0, NULL, 0);
+ __az6007_write(d, state, 0x00, 0, 0, NULL, 0);
+ __az6007_write(d, state, 0x00, 0, 0, NULL, 0);
}
pr_debug("Device is on %s state\n",
@@ -874,13 +906,6 @@ static int az6007_identify_state(struct dvb_usb_device *d, const char **name)
return ret;
}
-static void az6007_usb_disconnect(struct usb_interface *intf)
-{
- struct dvb_usb_device *d = usb_get_intfdata(intf);
- az6007_ci_uninit(d);
- dvb_usbv2_disconnect(intf);
-}
-
static int az6007_download_firmware(struct dvb_usb_device *d,
const struct firmware *fw)
{
@@ -889,6 +914,19 @@ static int az6007_download_firmware(struct dvb_usb_device *d,
return cypress_load_firmware(d->udev, fw, CYPRESS_FX2);
}
+static int az6007_init(struct dvb_usb_device *d)
+{
+ return az6007_ci_init(d);
+}
+
+static void az6007_exit(struct dvb_usb_device *d)
+{
+ struct az6007_device_state *state = d_to_priv(d);
+
+ if (state->ci_attached)
+ az6007_ci_uninit(d);
+}
+
/* DVB USB Driver stuff */
static struct dvb_usb_device_properties az6007_props = {
.driver_name = KBUILD_MODNAME,
@@ -906,6 +944,8 @@ static struct dvb_usb_device_properties az6007_props = {
.download_firmware = az6007_download_firmware,
.identify_state = az6007_identify_state,
.power_ctrl = az6007_power_ctrl,
+ .init = az6007_init,
+ .exit = az6007_exit,
.num_adapters = 1,
.adapter = {
{ .stream = DVB_USB_STREAM_BULK(0x02, 10, 4096), }
@@ -929,6 +969,8 @@ static struct dvb_usb_device_properties az6007_cablestar_hdci_props = {
.download_firmware = az6007_download_firmware,
.identify_state = az6007_identify_state,
.power_ctrl = az6007_power_ctrl,
+ .init = az6007_init,
+ .exit = az6007_exit,
.num_adapters = 1,
.adapter = {
{ .stream = DVB_USB_STREAM_BULK(0x02, 10, 4096), }
@@ -949,37 +991,17 @@ static const struct usb_device_id az6007_usb_table[] = {
MODULE_DEVICE_TABLE(usb, az6007_usb_table);
-static int az6007_suspend(struct usb_interface *intf, pm_message_t msg)
-{
- struct dvb_usb_device *d = usb_get_intfdata(intf);
-
- az6007_ci_uninit(d);
- return dvb_usbv2_suspend(intf, msg);
-}
-
-static int az6007_resume(struct usb_interface *intf)
-{
- struct dvb_usb_device *d = usb_get_intfdata(intf);
- struct dvb_usb_adapter *adap = &d->adapter[0];
-
- az6007_ci_init(adap);
- return dvb_usbv2_resume(intf);
-}
-
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver az6007_usb_driver = {
- .name = KBUILD_MODNAME,
- .id_table = az6007_usb_table,
- .probe = dvb_usbv2_probe,
- .disconnect = az6007_usb_disconnect,
- .no_dynamic_id = 1,
- .soft_unbind = 1,
- /*
- * FIXME: need to implement reset_resume, likely with
- * dvb-usb-v2 core support
- */
- .suspend = az6007_suspend,
- .resume = az6007_resume,
+ .name = KBUILD_MODNAME,
+ .id_table = az6007_usb_table,
+ .probe = dvb_usbv2_probe,
+ .disconnect = dvb_usbv2_disconnect,
+ .suspend = dvb_usbv2_suspend,
+ .resume = dvb_usbv2_resume,
+ .reset_resume = dvb_usbv2_reset_resume,
+ .no_dynamic_id = 1,
+ .soft_unbind = 1,
};
module_usb_driver(az6007_usb_driver);
--
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