[PATCH 6.10 057/149] ASoC: cs-amp-lib-test: Force test calibration blob entries to be valid

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6.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>

[ Upstream commit bff980d8d9ca537fd5f3c0e9a99876c1e3713e81 ]

For a normal calibration blob the calTarget values must be non-zero and
unique, and the calTime values must be non-zero. Don't rely on
get_random_bytes() to be random enough to guarantee this. Force the
calTarget and calTime values to be valid while retaining randomness
in the values.

Signed-off-by: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>
Fixes: 177862317a98 ("ASoC: cs-amp-lib: Add KUnit test for calibration helpers")
Link: https://patch.msgid.link/20240822115725.259568-1-rf@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 sound/soc/codecs/cs-amp-lib-test.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sound/soc/codecs/cs-amp-lib-test.c b/sound/soc/codecs/cs-amp-lib-test.c
index 15f991b2e16e2..8169ec88a8ba8 100644
--- a/sound/soc/codecs/cs-amp-lib-test.c
+++ b/sound/soc/codecs/cs-amp-lib-test.c
@@ -38,6 +38,7 @@ static void cs_amp_lib_test_init_dummy_cal_blob(struct kunit *test, int num_amps
 {
 	struct cs_amp_lib_test_priv *priv = test->priv;
 	unsigned int blob_size;
+	int i;
 
 	blob_size = offsetof(struct cirrus_amp_efi_data, data) +
 		    sizeof(struct cirrus_amp_cal_data) * num_amps;
@@ -49,6 +50,14 @@ static void cs_amp_lib_test_init_dummy_cal_blob(struct kunit *test, int num_amps
 	priv->cal_blob->count = num_amps;
 
 	get_random_bytes(priv->cal_blob->data, sizeof(struct cirrus_amp_cal_data) * num_amps);
+
+	/* Ensure all timestamps are non-zero to mark the entry valid. */
+	for (i = 0; i < num_amps; i++)
+		priv->cal_blob->data[i].calTime[0] |= 1;
+
+	/* Ensure that all UIDs are non-zero and unique. */
+	for (i = 0; i < num_amps; i++)
+		*(u8 *)&priv->cal_blob->data[i].calTarget[0] = i + 1;
 }
 
 static u64 cs_amp_lib_test_get_target_uid(struct kunit *test)
-- 
2.43.0







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