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

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[ Upstream commit db9795a43d ]

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 6ee2a7058f ("iio: accel: bma400: Fix smatch warning based on use
of unintialized value.").

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

Fixes: 961db2da15 ("iio: accel: bma400: Add support for single and double tap events")
Signed-off-by: Mikhail Lobanov <m.lobanov@rosalinux.ru>
Link: https://patch.msgid.link/20240910083624.27224-1-m.lobanov@rosalinux.ru
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mikhail Lobanov 2024-09-10 04:36:20 -04:00 committed by Greg Kroah-Hartman
parent 18916a684a
commit de1f0ab139
1 changed files with 2 additions and 1 deletions
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3
drivers/iio/accel/bma400_core.c
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@ -1219,7 +1219,8 @@ static int bma400_activity_event_en(struct bma400_data *data,
static int bma400_tap_event_en(struct bma400_data *data, static int bma400_tap_event_en(struct bma400_data *data,
enum iio_event_direction dir, int state) enum iio_event_direction dir, int state)
{ {
unsigned int mask, field_value; unsigned int mask;
unsigned int field_value = 0;
int ret; int ret;
/* /*