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V4L/DVB (10254): em28xx: Fix audio URB transfer buffer race condition

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em28xx: Fix audio URB transfer buffer memory leak and race
condition/corruption of capture pointer

Leak fix kindly contributed by Pádraig Brady.

Signed-off-by: Robert Krakora <rob.krakora@messagenetsystems.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Robert Krakora 2009-01-16 11:23:25 -03:00 committed by Mauro Carvalho Chehab
parent ba390f0055
commit 53d12e5a56
1 changed files with 8 additions and 1 deletions
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9
drivers/media/video/em28xx/em28xx-audio.c
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@ -65,6 +65,9 @@ static int em28xx_isoc_audio_deinit(struct em28xx *dev)
usb_unlink_urb(dev->adev.urb[i]);
usb_free_urb(dev->adev.urb[i]);
dev->adev.urb[i] = NULL;
kfree(dev->adev.transfer_buffer[i]);
dev->adev.transfer_buffer[i] = NULL;
}
return 0;
@ -389,11 +392,15 @@ static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
*substream)
{
struct em28xx *dev;
unsigned long flags;
struct em28xx *dev;
snd_pcm_uframes_t hwptr_done;
dev = snd_pcm_substream_chip(substream);
spin_lock_irqsave(&dev->adev.slock, flags);
hwptr_done = dev->adev.hwptr_done_capture;
spin_unlock_irqrestore(&dev->adev.slock, flags);
return hwptr_done;
}