usb: dvb-usb: fix memory leak in dvb_usb_adapter_init
syzbot reported memory leak in dvb-usb. The problem was
in invalid error handling in dvb_usb_adapter_init().
for (n = 0; n < d->props.num_adapters; n++) {
....
if ((ret = dvb_usb_adapter_stream_init(adap)) ||
(ret = dvb_usb_adapter_dvb_init(adap, adapter_nrs)) ||
(ret = dvb_usb_adapter_frontend_init(adap))) {
return ret;
}
...
d->num_adapters_initialized++;
...
}
In case of error in dvb_usb_adapter_dvb_init() or dvb_usb_adapter_dvb_init()
d->num_adapters_initialized won't be incremented, but dvb_usb_adapter_exit()
relies on this:
for (n = 0; n < d->num_adapters_initialized; n++)
So, allocated objects won't be freed.
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Reported-by: syzbot+3c2be7424cea3b932b0e@syzkaller.appspotmail.com
Change-Id: Ic2bfba5504ea85fddbf7682f20ed1788d42fd84d
diff --git a/drivers/media/usb/dvb-usb/dvb-usb-init.c b/drivers/media/usb/dvb-usb/dvb-usb-init.c
index c1a7634..3807098 100644
--- a/drivers/media/usb/dvb-usb/dvb-usb-init.c
+++ b/drivers/media/usb/dvb-usb/dvb-usb-init.c
@@ -79,11 +79,14 @@
}
}
- if ((ret = dvb_usb_adapter_stream_init(adap)) ||
- (ret = dvb_usb_adapter_dvb_init(adap, adapter_nrs)) ||
- (ret = dvb_usb_adapter_frontend_init(adap))) {
+ if ((ret = dvb_usb_adapter_stream_init(adap)))
return ret;
- }
+
+ if ((ret = dvb_usb_adapter_dvb_init(adap, adapter_nrs)))
+ goto dvb_init_err;
+
+ if ((ret = dvb_usb_adapter_frontend_init(adap)))
+ goto frontend_init_err;
/* use exclusive FE lock if there is multiple shared FEs */
if (adap->fe_adap[1].fe)
@@ -103,6 +106,12 @@
}
return 0;
+
+frontend_init_err:
+ dvb_usb_adapter_dvb_exit(adap);
+dvb_init_err:
+ dvb_usb_adapter_stream_exit(adap);
+ return ret;
}
static int dvb_usb_adapter_exit(struct dvb_usb_device *d)