ALSA: usx2y: Don't call free_pages_exact() with NULL address
Unlike some other functions, we can't pass NULL pointer to free_pages_exact(). Add a proper NULL check for avoiding possible Oops. Link: https://lore.kernel.org/r/20210517131545.27252-10-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -143,8 +143,11 @@ void usb_stream_free(struct usb_stream_kernel *sk)
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if (!s)
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return;
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free_pages_exact(sk->write_page, s->write_size);
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sk->write_page = NULL;
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if (sk->write_page) {
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free_pages_exact(sk->write_page, s->write_size);
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sk->write_page = NULL;
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}
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free_pages_exact(s, s->read_size);
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sk->s = NULL;
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}
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