[media] au8522: Avoid memory leak for device config data
As reported by kmemleak:
unreferenced object 0xffff880321e1da40 (size 32):
comm "modprobe", pid 3309, jiffies 4295019569 (age 2359.636s)
hex dump (first 32 bytes):
47 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 G...............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff82278c8e>] kmemleak_alloc+0x4e/0xb0
[<ffffffff8153c08c>] kmem_cache_alloc_trace+0x1ec/0x280
[<ffffffffa13a896a>] au8522_probe+0x19a/0xa30 [au8522_decoder]
[<ffffffff81de0032>] i2c_device_probe+0x2b2/0x490
[<ffffffff81ca7004>] driver_probe_device+0x454/0xd90
[<ffffffff81ca7c1b>] __device_attach_driver+0x17b/0x230
[<ffffffff81ca15da>] bus_for_each_drv+0x11a/0x1b0
[<ffffffff81ca6a4d>] __device_attach+0x1cd/0x2c0
[<ffffffff81ca7d43>] device_initial_probe+0x13/0x20
[<ffffffff81ca451f>] bus_probe_device+0x1af/0x250
[<ffffffff81c9e0f3>] device_add+0x943/0x13b0
[<ffffffff81c9eb7a>] device_register+0x1a/0x20
[<ffffffff81de8626>] i2c_new_device+0x5d6/0x8f0
[<ffffffffa0d88ea4>] v4l2_i2c_new_subdev_board+0x1e4/0x250 [v4l2_common]
[<ffffffffa0d88fe7>] v4l2_i2c_new_subdev+0xd7/0x110 [v4l2_common]
[<ffffffffa13b2f76>] au0828_card_analog_fe_setup+0x2e6/0x3f0 [au0828]
Checking where the error happens:
(gdb) list *au8522_probe+0x19a
0x99a is in au8522_probe (drivers/media/dvb-frontends/au8522_decoder.c:761).
756 printk(KERN_INFO "au8522_decoder attach existing instance.\n");
757 break;
758 }
759
760 demod_config = kzalloc(sizeof(struct au8522_config), GFP_KERNEL);
761 if (demod_config == NULL) {
762 if (instance == 1)
763 kfree(state);
764 return -ENOMEM;
765 }
Shows that the error path is not being handled properly.
The are actually several issues here:
1) config free should have been calling hybrid_tuner_release_state()
function, by calling au8522_release_state();
2) config is only allocated at the digital part. On the analog one,
it is received from the caller.
A complex logic could be added to address it, however, it is simpler
to just embeed config inside the state.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
diff --git a/drivers/media/dvb-frontends/au8522_dig.c b/drivers/media/dvb-frontends/au8522_dig.c
index f956f13..6c1e976 100644
--- a/drivers/media/dvb-frontends/au8522_dig.c
+++ b/drivers/media/dvb-frontends/au8522_dig.c
@@ -566,7 +566,7 @@
au8522_writereg(state,
VSB_mod_tab[i].reg,
VSB_mod_tab[i].data);
- au8522_set_if(fe, state->config->vsb_if);
+ au8522_set_if(fe, state->config.vsb_if);
break;
case QAM_64:
dprintk("%s() QAM 64\n", __func__);
@@ -574,7 +574,7 @@
au8522_writereg(state,
QAM64_mod_tab[i].reg,
QAM64_mod_tab[i].data);
- au8522_set_if(fe, state->config->qam_if);
+ au8522_set_if(fe, state->config.qam_if);
break;
case QAM_256:
if (zv_mode) {
@@ -583,7 +583,7 @@
au8522_writereg(state,
QAM256_mod_tab_zv_mode[i].reg,
QAM256_mod_tab_zv_mode[i].data);
- au8522_set_if(fe, state->config->qam_if);
+ au8522_set_if(fe, state->config.qam_if);
msleep(100);
au8522_writereg(state, 0x821a, 0x00);
} else {
@@ -592,7 +592,7 @@
au8522_writereg(state,
QAM256_mod_tab[i].reg,
QAM256_mod_tab[i].data);
- au8522_set_if(fe, state->config->qam_if);
+ au8522_set_if(fe, state->config.qam_if);
}
break;
default:
@@ -666,7 +666,7 @@
*status |= FE_HAS_LOCK | FE_HAS_SYNC;
}
- switch (state->config->status_mode) {
+ switch (state->config.status_mode) {
case AU8522_DEMODLOCKING:
dprintk("%s() DEMODLOCKING\n", __func__);
if (*status & FE_HAS_VITERBI)
@@ -704,7 +704,7 @@
static int au8522_led_status(struct au8522_state *state, const u16 *snr)
{
- struct au8522_led_config *led_config = state->config->led_cfg;
+ struct au8522_led_config *led_config = state->config.led_cfg;
int led;
u16 strong;
@@ -758,7 +758,7 @@
au8522_readreg(state, 0x4311),
snr);
- if (state->config->led_cfg)
+ if (state->config.led_cfg)
au8522_led_status(state, snr);
return ret;
@@ -866,7 +866,7 @@
}
/* setup the state */
- state->config = config;
+ state->config = *config;
state->i2c = i2c;
state->operational_mode = AU8522_DIGITAL_MODE;