linux-kernel - [PATCH 23/28] iio: pressure: bmp280: use = { } instead of memset()

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Message-Id: <20250611-iio-zero-init-stack-with-instead-of-memset-v1-23-ebb2d0a24302@baylibre.com>
Date: Wed, 11 Jun 2025 17:39:15 -0500
From: David Lechner <dlechner@...libre.com>
To: Michael Hennerich <michael.hennerich@...log.com>, 
 Lars-Peter Clausen <lars@...afoo.de>, Jonathan Cameron <jic23@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Heiko Stuebner <heiko@...ech.de>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Francesco Dolcini <francesco@...cini.it>, 
 João Paulo Gonçalves <jpaulo.silvagoncalves@...il.com>, 
 Leonard Göhrs <l.goehrs@...gutronix.de>, 
 kernel@...gutronix.de, Oleksij Rempel <o.rempel@...gutronix.de>, 
 Roan van Dijk <roan@...tonic.nl>, 
 Tomasz Duszynski <tomasz.duszynski@...akon.com>, 
 Jacopo Mondi <jacopo@...ndi.org>, 
 Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@....com>, 
 Mudit Sharma <muditsharma.info@...il.com>, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>, 
 Ondřej Jirman <megi@....cz>, 
 Andreas Klinger <ak@...klinger.de>, 
 Petre Rodan <petre.rodan@...dimension.ro>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org, 
 linux-stm32@...md-mailman.stormreply.com, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH 23/28] iio: pressure: bmp280: use = { } instead of memset()

Use { } instead of memset() to zero-initialize stack memory to simplify
the code.

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/iio/pressure/bmp280-core.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index f37f20776c89173b0b2a8e28be0ef9aa30ceea53..74505c9ec1a08cf3ffdb55bf578d40ede3cc5d00 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -1234,12 +1234,9 @@ static irqreturn_t bme280_trigger_handler(int irq, void *p)
 		s32 comp_temp;
 		u32 comp_humidity;
 		aligned_s64 timestamp;
-	} buffer;
+	} buffer = { }; /* Don't leak uninitialized stack to userspace. */
 	int ret;
 
-	/* Don't leak uninitialized stack to userspace. */
-	memset(&buffer, 0, sizeof(buffer));
-
 	guard(mutex)(&data->lock);
 
 	/* Burst read data registers */

-- 
2.43.0