Unlike some other functions, we can't pass NULL pointer to free_pages_exact(). Add a proper NULL check for avoiding possible Oops.
Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/usb/usx2y/usb_stream.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/sound/usb/usx2y/usb_stream.c b/sound/usb/usx2y/usb_stream.c index 820647331aba..9d0e44793896 100644 --- a/sound/usb/usx2y/usb_stream.c +++ b/sound/usb/usx2y/usb_stream.c @@ -143,8 +143,11 @@ void usb_stream_free(struct usb_stream_kernel *sk) if (!s) return;
- free_pages_exact(sk->write_page, s->write_size); - sk->write_page = NULL; + if (sk->write_page) { + free_pages_exact(sk->write_page, s->write_size); + sk->write_page = NULL; + } + free_pages_exact(s, s->read_size); sk->s = NULL; }