From f41ced8f108cc80f16509b907cd7ac93944459bc Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Tue, 6 Jan 2009 14:40:40 -0800 Subject: Check fops_get() return value Several subsystem open handlers dereference the fops_get() return value without checking it for nullness. This opens a race condition between the open handler and module unloading. A module can be marked as being unloaded (MODULE_STATE_GOING) before its exit function is called and gets the chance to unregister the driver. During that window open handlers can still be called, and fops_get() will fail in try_module_get() and return a NULL pointer. This change checks the fops_get() return value and returns -ENODEV if NULL. Reported-by: Alan Jenkins Signed-off-by: Laurent Pinchart Acked-by: Takashi Iwai Cc: Al Viro Cc: Dave Airlie Acked-by: Mauro Carvalho Chehab Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/media/dvb/dvb-core/dvbdev.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/media') diff --git a/drivers/media/dvb/dvb-core/dvbdev.c b/drivers/media/dvb/dvb-core/dvbdev.c index 65d69665f1fc..6a32680dbb1b 100644 --- a/drivers/media/dvb/dvb-core/dvbdev.c +++ b/drivers/media/dvb/dvb-core/dvbdev.c @@ -79,6 +79,10 @@ static int dvb_device_open(struct inode *inode, struct file *file) file->private_data = dvbdev; old_fops = file->f_op; file->f_op = fops_get(dvbdev->fops); + if (file->f_op == NULL) { + file->f_op = old_fops; + goto fail; + } if(file->f_op->open) err = file->f_op->open(inode,file); if (err) { @@ -90,6 +94,7 @@ static int dvb_device_open(struct inode *inode, struct file *file) unlock_kernel(); return err; } +fail: up_read(&minor_rwsem); unlock_kernel(); return -ENODEV; -- cgit v1.2.2