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media: pvrusb2: fix null-ptr-deref in class_unregister()

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The class_ptr will be NULL if pvr2_sysfs_class_create() fails
in pvr_init(), when call pvr2_sysfs_class_destroy(), it will
lead to null-ptr-deref, fix it.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Kefeng Wang 2019-06-05 09:08:20 -04:00 committed by Mauro Carvalho Chehab
parent 7aac98494d
commit 6e2980cc68
1 changed files with 2 additions and 1 deletions
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3
drivers/media/usb/pvrusb2/pvrusb2-sysfs.c
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@ -802,7 +802,8 @@ struct pvr2_sysfs_class *pvr2_sysfs_class_create(void)
void pvr2_sysfs_class_destroy(struct pvr2_sysfs_class *clp)
{
pvr2_sysfs_trace("Unregistering pvr2_sysfs_class id=%p", clp);
class_unregister(&clp->class);
if (clp)
class_unregister(&clp->class);
}