[PATCH] ASoC: simple-card-utils: Avoid NULL deref in asoc_simple_set_tdm()

[PATCH] ASoC: simple-card-utils: Avoid NULL deref in asoc_simple_set_tdm()

[Richard Fitzgerald]

Don't dereference simple_dai before it has been checked for NULL.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: 1e974e5b82b3 ("ASoC: audio_graph_card2: Add support for variable slot widths")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 sound/soc/generic/simple-card-utils.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 8e037835bc58..f2157944247f 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -364,13 +364,15 @@ static int asoc_simple_set_tdm(struct snd_soc_dai *dai,
 				struct snd_pcm_hw_params *params)
 {
 	int sample_bits = params_width(params);
-	int slot_width = simple_dai->slot_width;
-	int slot_count = simple_dai->slots;
+	int slot_width, slot_count;
 	int i, ret;
 
 	if (!simple_dai || !simple_dai->tdm_width_map)
 		return 0;
 
+	slot_width = simple_dai->slot_width;
+	slot_count = simple_dai->slots;
+
 	if (slot_width == 0)
 		slot_width = sample_bits;
 
-- 
2.30.2

Re: [PATCH] ASoC: simple-card-utils: Avoid NULL deref in asoc_simple_set_tdm()

[Mark Brown]

On Mon, 4 Apr 2022 12:32:52 +0100, Richard Fitzgerald wrote:
> Don't dereference simple_dai before it has been checked for NULL.
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: simple-card-utils: Avoid NULL deref in asoc_simple_set_tdm()
      commit: 51a630a7051f7f4f1cfdd64c20c7110f9907c230

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark