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ALSA: memalloc: Catch call with NULL snd_dma_buffer pointer 

Although we've covered all calls with NULL dma buffer pointer, so far,
there may be still some else in the wild.  For catching such a case
more easily, add a WARN_ON_ONCE() in snd_dma_get_ops().

Fixes: 37af81c599 ("ALSA: core: Abstract memory alloc helpers")
Link: https://lore.kernel.org/r/20211105102103.28148-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2021-11-05 11:21:03 +01:00
parent 7599acb7b9
commit dce9446192
1 changed files with 2 additions and 0 deletions
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2
sound/core/memalloc.c
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@ -631,6 +631,8 @@ static const struct snd_malloc_ops *dma_ops[] = {
static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab)
{
if (WARN_ON_ONCE(!dmab))
return NULL;
if (WARN_ON_ONCE(dmab->dev.type <= SNDRV_DMA_TYPE_UNKNOWN ||
dmab->dev.type >= ARRAY_SIZE(dma_ops)))
return NULL;