The wov_hotword_model_put() function has multiple large variables on its stack, the largest of which is the result of SHASH_DESC_ON_STACK(). In total, this exceeds the warning limit for 32-bit architectures:

sound/soc/codecs/cros_ec_codec.c:776:12: error: stack frame size of 1152 bytes in function 'wov_hotword_model_put' [-Werror,-Wframe-larger-than=]

The function already has a dynamic crypto_alloc_shash() allocation, so using kmalloc() for the descriptor is correct as well and does not introduce any additional failure scenarios. With this, the stack usage of wov_hotword_model_put() gets reduced to 480 bytes in my test configuration.

Fixes: b6bc07d4360d ("ASoC: cros_ec_codec: support WoV") Signed-off-by: Arnd Bergmann arnd@arndb.de --- sound/soc/codecs/cros_ec_codec.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/sound/soc/codecs/cros_ec_codec.c b/sound/soc/codecs/cros_ec_codec.c index d3dc42aa6825..1948bc6971f6 100644 --- a/sound/soc/codecs/cros_ec_codec.c +++ b/sound/soc/codecs/cros_ec_codec.c @@ -108,22 +108,23 @@ static int calculate_sha256(struct cros_ec_codec_priv *priv, uint8_t *buf, uint32_t size, uint8_t *digest) { struct crypto_shash *tfm; + struct shash_desc *desc;

tfm = crypto_alloc_shash("sha256", CRYPTO_ALG_TYPE_SHASH, 0); if (IS_ERR(tfm)) { dev_err(priv->dev, "can't alloc shash\n"); return PTR_ERR(tfm); } - - { - SHASH_DESC_ON_STACK(desc, tfm); - - desc->tfm = tfm; - - crypto_shash_digest(desc, buf, size, digest); - shash_desc_zero(desc); + desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(tfm), GFP_KERNEL); + if (!desc) { + crypto_free_shash(tfm); + return -ENOMEM; } + desc->tfm = tfm; + crypto_shash_digest(desc, buf, size, digest); + shash_desc_zero(desc);

+ kfree(desc); crypto_free_shash(tfm);

#ifdef DEBUG