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[6/8] ASoC: Intel: bdw_rt286: add checks to avoid static analysis warnings

Message ID 20230731213748.440285-7-pierre-louis.bossart@linux.intel.com (mailing list archive)
State Accepted
Commit 64778b022e629b8ffa97d23a9adbf670aa3bb1d8
Headers show
Series ASoC/SOF/Intel/AMD: cleanups for GCC11 -fanalyzer checks | expand

Commit Message

Pierre-Louis Bossart July 31, 2023, 9:37 p.m. UTC 
snd_soc_card_get_codec_dai() can return NULL, but that value is not
checked for, leading to false-positive static analysis warnings

sound/soc/intel/boards/bdw_rt286.c:190:16: error: dereference of NULL
‘codec_dai’ [CWE-476] [-Werror=analyzer-null-dereference]

  190 |         return snd_soc_component_set_jack(codec_dai->component, NULL, NULL);
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  ‘card_suspend_pre’: event 1
    |
    |  190 |         return snd_soc_component_set_jack(codec_dai->component, NULL, NULL);
    |      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    |      |                |
    |      |                (1) dereference of NULL ‘codec_dai’

This NULL dereference cannot happen, the codec-dai "rt286-aif1" must exists
otherwise the card would not be created. Static analysis cannot know
that however so we might as well squelch this report.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Yaochun Hung <yc.hung@mediatek.com>
---
 sound/soc/intel/boards/bdw_rt286.c | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/sound/soc/intel/boards/bdw_rt286.c b/sound/soc/intel/boards/bdw_rt286.c
index b7687a93a923..036579331d8f 100644
--- a/sound/soc/intel/boards/bdw_rt286.c
+++ b/sound/soc/intel/boards/bdw_rt286.c
@@ -187,6 +187,9 @@  static int card_suspend_pre(struct snd_soc_card *card)
 {
 	struct snd_soc_dai *codec_dai = snd_soc_card_get_codec_dai(card, "rt286-aif1");
 
+	if (!codec_dai)
+		return 0;
+
 	return snd_soc_component_set_jack(codec_dai->component, NULL, NULL);
 }
 
@@ -194,6 +197,9 @@  static int card_resume_post(struct snd_soc_card *card)
 {
 	struct snd_soc_dai *codec_dai = snd_soc_card_get_codec_dai(card, "rt286-aif1");
 
+	if (!codec_dai)
+		return 0;
+
 	return snd_soc_component_set_jack(codec_dai->component, &card_headset, NULL);
 }