sound: sgio2audio/pdaudiocf/usb-audio: initialize PCM buffer

commit 3e85fd61 upstream.

When allocating the PCM buffer, use vmalloc_user() instead of vmalloc().
Otherwise, it would be possible for applications to play the previous
contents of the kernel memory to the speakers, or to read it directly if
the buffer is exported to userspace.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

sound/mips/sgio2audio.c

@@ -609,7 +609,7 @@ static int snd_sgio2audio_pcm_hw_params(struct snd_pcm_substream *substream,
 	/* alloc virtual 'dma' area */
 	if (runtime->dma_area)
 		vfree(runtime->dma_area);
-	runtime->dma_area = vmalloc(size);
+	runtime->dma_area = vmalloc_user(size);
 	if (runtime->dma_area == NULL)
 		return -ENOMEM;
 	runtime->dma_bytes = size;

sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c

@@ -51,7 +51,7 @@ static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t s
 			return 0; /* already enough large */
 		vfree(runtime->dma_area);
 	}
-	runtime->dma_area = vmalloc_32(size);
+	runtime->dma_area = vmalloc_32_user(size);
 	if (! runtime->dma_area)
 		return -ENOMEM;
 	runtime->dma_bytes = size;

sound/usb/usbaudio.c

@@ -752,7 +752,7 @@ static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t s
 			return 0; /* already large enough */
 		vfree(runtime->dma_area);
 	}
-	runtime->dma_area = vmalloc(size);
+	runtime->dma_area = vmalloc_user(size);
 	if (!runtime->dma_area)
 		return -ENOMEM;
 	runtime->dma_bytes = size;