github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-08 14:42:37 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

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

Browse Source 
commit 3e85fd614c 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>
This commit is contained in:
Clemens Ladisch 2009-12-18 09:27:24 +01:00 committed by Greg Kroah-Hartman
parent e255d3c8a8
commit aec8dc2b5d
3 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sound/mips/sgio2audio.c
View File

@ -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;

2
sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c
View File

@ -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;

2
sound/usb/usbaudio.c
View File

@ -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;