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driver-core: Fix possible null reference in subsys_interface_unregister 

Check if the sif is not NULL before de-referencing it

Signed-off-by: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jonghwan Choi 2012-01-14 11:06:03 +09:00 committed by Greg Kroah-Hartman
parent c56d8a7362
commit 2b31594a95
1 changed files with 4 additions and 2 deletions
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6
drivers/base/bus.c
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@ -1193,13 +1193,15 @@ EXPORT_SYMBOL_GPL(subsys_interface_register);
void subsys_interface_unregister(struct subsys_interface *sif) void subsys_interface_unregister(struct subsys_interface *sif)
{ {
struct bus_type *subsys = sif->subsys; struct bus_type *subsys;
struct subsys_dev_iter iter; struct subsys_dev_iter iter;
struct device *dev; struct device *dev;
if (!sif) if (!sif || !sif->subsys)
return; return;
subsys = sif->subsys;
mutex_lock(&subsys->p->mutex); mutex_lock(&subsys->p->mutex);
list_del_init(&sif->node); list_del_init(&sif->node);
if (sif->remove_dev) { if (sif->remove_dev) {