[PATCH 5.15 083/402] thermal/drivers/tsens: Fix null pointer dereference

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

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

From: Aleksandr Mishin <amishin@xxxxxxxxxx>

[ Upstream commit d998ddc86a27c92140b9f7984ff41e3d1d07a48f ]

compute_intercept_slope() is called from calibrate_8960() (in tsens-8960.c)
as compute_intercept_slope(priv, p1, NULL, ONE_PT_CALIB) which lead to null
pointer dereference (if DEBUG or DYNAMIC_DEBUG set).
Fix this bug by adding null pointer check.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: dfc1193d4dbd ("thermal/drivers/tsens: Replace custom 8960 apis with generic apis")
Signed-off-by: Aleksandr Mishin <amishin@xxxxxxxxxx>
Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240411114021.12203-1-amishin@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/thermal/qcom/tsens.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
index 926cd8b41132c..2f31129cd5471 100644
--- a/drivers/thermal/qcom/tsens.c
+++ b/drivers/thermal/qcom/tsens.c
@@ -84,7 +84,7 @@ void compute_intercept_slope(struct tsens_priv *priv, u32 *p1,
 	for (i = 0; i < priv->num_sensors; i++) {
 		dev_dbg(priv->dev,
 			"%s: sensor%d - data_point1:%#x data_point2:%#x\n",
-			__func__, i, p1[i], p2[i]);
+			__func__, i, p1[i], p2 ? p2[i] : 0);
 
 		if (!priv->sensor[i].slope)
 			priv->sensor[i].slope = SLOPE_DEFAULT;
-- 
2.43.0







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