[PATCH] iio: accel: bma400: Fix uninitialized variable field_value in tap event handling.

[Mikhail Lobanov]

In the current implementation, the local variable field_value is used
without prior initialization, which may lead to reading uninitialized
memory. Specifically, in the macro set_mask_bits, the initial
(potentially uninitialized) value of the buffer is copied into old__,
and a mask is applied to calculate new__. A similar issue was resolved in
commit 6ee2a7058fea ("iio: accel: bma400: Fix smatch warning based on use
of unintialized value.").

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

Fixes: 961db2da159d ("iio: accel: bma400: Add support for single and double tap events")
Signed-off-by: Mikhail Lobanov <m.lobanov@xxxxxxxxxxxx>
---
 drivers/iio/accel/bma400_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/accel/bma400_core.c b/drivers/iio/accel/bma400_core.c
index e90e2f01550a..04083b7395ab 100644
--- a/drivers/iio/accel/bma400_core.c
+++ b/drivers/iio/accel/bma400_core.c
@@ -1219,7 +1219,8 @@ static int bma400_activity_event_en(struct bma400_data *data,
 static int bma400_tap_event_en(struct bma400_data *data,
 			       enum iio_event_direction dir, int state)
 {
-	unsigned int mask, field_value;
+	unsigned int mask;
+	unsigned int field_value = 0;
 	int ret;
 
 	/*
-- 
2.43.0