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ALSA: pcm: Check for null pointer of pointer substream before dereferencing it 

Pointer substream is being dereferenced on the assignment of pointer card
before substream is being null checked with the macro PCM_RUNTIME_CHECK.
Although PCM_RUNTIME_CHECK calls BUG_ON, it still is useful to perform the
the pointer check before card is assigned.

Fixes: d4cfb30fce ("ALSA: pcm: Set per-card upper limit of PCM buffer allocations")
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20220424205945.1372247-1-colin.i.king@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Colin Ian King 2022-04-24 21:59:45 +01:00 committed by Takashi Iwai
parent c92b576a13
commit 011b559be8
1 changed files with 2 additions and 1 deletions
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3
sound/core/pcm_memory.c
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@ -453,7 +453,6 @@ EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
*/
int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream)
{
struct snd_card *card = substream->pcm->card;
struct snd_pcm_runtime *runtime;
if (PCM_RUNTIME_CHECK(substream))
@ -462,6 +461,8 @@ int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream)
if (runtime->dma_area == NULL)
return 0;
if (runtime->dma_buffer_p != &substream->dma_buffer) {
struct snd_card *card = substream->pcm->card;
/* it's a newly allocated buffer. release it now. */
do_free_pages(card, runtime->dma_buffer_p);
kfree(runtime->dma_buffer_p);