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media: 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 it:

	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
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Pavel Skripkin 2021-03-28 21:32:19 +02:00 committed by Mauro Carvalho Chehab
parent 3ddcea9f7d
commit b7cd0da982
1 changed files with 16 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/media/usb/dvb-usb/dvb-usb-init.c
View File

@ -79,11 +79,17 @@ static int dvb_usb_adapter_init(struct dvb_usb_device *d, short *adapter_nrs)
}
}
if ((ret = dvb_usb_adapter_stream_init(adap)) ||
(ret = dvb_usb_adapter_dvb_init(adap, adapter_nrs)) ||
(ret = dvb_usb_adapter_frontend_init(adap))) {
ret = dvb_usb_adapter_stream_init(adap);
if (ret)
return ret;
}
ret = dvb_usb_adapter_dvb_init(adap, adapter_nrs);
if (ret)
goto dvb_init_err;
ret = dvb_usb_adapter_frontend_init(adap);
if (ret)
goto frontend_init_err;
/* use exclusive FE lock if there is multiple shared FEs */
if (adap->fe_adap[1].fe)
@ -103,6 +109,12 @@ static int dvb_usb_adapter_init(struct dvb_usb_device *d, short *adapter_nrs)
}
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)