From 7b0962d32362a0d56627a1dfdb4e8229c5f51f94 Mon Sep 17 00:00:00 2001 From: David Fries Date: Thu, 15 Dec 2011 01:59:20 -0300 Subject: [PATCH] [media] cx88-dvb avoid dangling core->gate_ctrl pointer dvb_register calls videobuf_dvb_register_bus, but if that returns a failure the module will be unloaded without clearing the value of core->gate_ctrl which will cause an oops in macros called from video_open in cx88-video.c Signed-off-by: David Fries Cc: Mauro Carvalho Chehab Cc: Istvan Varga Cc: Jonathan Nieder Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/cx88/cx88-dvb.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/media/video/cx88/cx88-dvb.c b/drivers/media/video/cx88/cx88-dvb.c index cf3d33ab541b..396149824fcd 100644 --- a/drivers/media/video/cx88/cx88-dvb.c +++ b/drivers/media/video/cx88/cx88-dvb.c @@ -954,6 +954,7 @@ static int dvb_register(struct cx8802_dev *dev) struct cx88_core *core = dev->core; struct videobuf_dvb_frontend *fe0, *fe1 = NULL; int mfe_shared = 0; /* bus not shared by default */ + int res = -EINVAL; if (0 != core->i2c_rc) { printk(KERN_ERR "%s/2: no i2c-bus available, cannot attach dvb drivers\n", core->name); @@ -1566,13 +1567,16 @@ static int dvb_register(struct cx8802_dev *dev) call_all(core, core, s_power, 0); /* register everything */ - return videobuf_dvb_register_bus(&dev->frontends, THIS_MODULE, dev, - &dev->pci->dev, adapter_nr, mfe_shared, NULL); + res = videobuf_dvb_register_bus(&dev->frontends, THIS_MODULE, dev, + &dev->pci->dev, adapter_nr, mfe_shared, NULL); + if (res) + goto frontend_detach; + return res; frontend_detach: core->gate_ctrl = NULL; videobuf_dvb_dealloc_frontends(&dev->frontends); - return -EINVAL; + return res; } /* ----------------------------------------------------------- */ -- 2.39.5