[PATCH 6.1 131/473] thermal/drivers/tsens: Fix null pointer dereference

Greg Kroah-Hartman
2024-06-06T14:14:15Z

From: Aleksandr Mishin <amishin@t-argos.ru>

[ 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@t-argos.ru>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20240411114021.12203-1-amishin@t-argos.ru
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 252c5ffdd1b66..fc58db60852a0 100644
--- a/drivers/thermal/qcom/tsens.c
+++ b/drivers/thermal/qcom/tsens.c
@@ -85,7 +85,7 @@ 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