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[media] dvb core: only start media entity if not NULL

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The logic there tries to start the media entity even if it
doesn't exist, causing this bug:

	[  314.356162] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
	[  314.356202] IP: [<ffffffffa02ef74c>] media_entity_pipeline_start+0x1c/0x390 [media]

Reported-by: Gert-Jan van der Stroom <gjstroom@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2015-02-23 09:41:17 -03:00
parent 99a85b901e
commit 8a26a258bd
1 changed files with 3 additions and 2 deletions
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5
drivers/media/dvb-core/dvb_frontend.c
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@ -712,7 +712,7 @@ static int dvb_frontend_thread(void *data)
/* FIXME: return an error if it fails */
dev_info(fe->dvb->device,
"proceeding with FE task\n");
} else {
} else if (fepriv->pipe_start_entity) {
ret = media_entity_pipeline_start(fepriv->pipe_start_entity,
&fepriv->pipe);
if (ret)
@ -830,7 +830,8 @@ restart:
}
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
media_entity_pipeline_stop(fepriv->pipe_start_entity);
if (fepriv->pipe_start_entity)
media_entity_pipeline_stop(fepriv->pipe_start_entity);
fepriv->pipe_start_entity = NULL;
#endif