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ALSA: compress_offload: dereference after checking for NULL pointer

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Fix cppcheck warning and only dereference once the initial checks are
done:

sound/core/compress_offload.c:516:38: warning: Either the condition
'!stream' is redundant or there is possible null pointer dereference:
stream. [nullPointerRedundantCheck]
 struct snd_compr_runtime *runtime = stream->runtime;
                                     ^
sound/core/compress_offload.c:518:17: note: Assuming that condition
'!stream' is not redundant
if (snd_BUG_ON(!(stream) || !(stream)->runtime))
                ^
sound/core/compress_offload.c:516:38: note: Null pointer dereference
 struct snd_compr_runtime *runtime = stream->runtime;
                                     ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Acked-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20200902212133.30964-7-pierre-louis.bossart@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Pierre-Louis Bossart 2020-09-02 16:21:21 -05:00 committed by Takashi Iwai
parent 3bcf8eeb7d
commit cd91fd9f0a
1 changed files with 2 additions and 1 deletions
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3
sound/core/compress_offload.c
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@ -513,10 +513,11 @@ EXPORT_SYMBOL(snd_compr_malloc_pages);
int snd_compr_free_pages(struct snd_compr_stream *stream) int snd_compr_free_pages(struct snd_compr_stream *stream)
{ {
struct snd_compr_runtime *runtime = stream->runtime; struct snd_compr_runtime *runtime;
if (snd_BUG_ON(!(stream) || !(stream)->runtime)) if (snd_BUG_ON(!(stream) || !(stream)->runtime))
return -EINVAL; return -EINVAL;
runtime = stream->runtime;
if (runtime->dma_area == NULL) if (runtime->dma_area == NULL)
return 0; return 0;
if (runtime->dma_buffer_p != &stream->dma_buffer) { if (runtime->dma_buffer_p != &stream->dma_buffer) {