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[188.141.5.72]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45052a4878fsm5856560f8f.9.2026.05.05.10.34.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 May 2026 10:34:58 -0700 (PDT) From: David Carlier To: Jonathan Cameron Cc: dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, David Carlier Subject: [PATCH] iio: pressure: bmp280: zero-init bmp580 trigger handler buffer Date: Tue, 5 May 2026 18:34:55 +0100 Message-ID: <20260505173455.181358-1-devnexen@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit bmp580_trigger_handler() builds an on-stack scan buffer containing two __le32 fields and an aligned_s64 timestamp, and pushes it to userspace via iio_push_to_buffers_with_ts(). However, only the low 3 bytes of each __le32 field are populated by the device data: memcpy(&buffer.comp_press, &data->buf[3], 3); memcpy(&buffer.comp_temp, &data->buf[0], 3); The high byte of each field is left uninitialised on the stack. The bmp580 channels declare storagebits = 32, so the IIO core transports all four bytes per sample to userspace as part of the scan element, leaking two bytes of kernel stack per scan. Zero-initialise the buffer before populating it, mirroring the fix applied to bme280_trigger_handler() in commit 018f50909e66 ("iio: bmp280: zero-init buffer"). Fixes: 872c8014e05e ("iio: pressure: bmp280: drop sensor_data array") Cc: stable@vger.kernel.org Signed-off-by: David Carlier --- drivers/iio/pressure/bmp280-core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c index f37f20776c89..431476cff883 100644 --- a/drivers/iio/pressure/bmp280-core.c +++ b/drivers/iio/pressure/bmp280-core.c @@ -2623,6 +2623,8 @@ static irqreturn_t bmp580_trigger_handler(int irq, void *p) } buffer; int ret; + memset(&buffer, 0, sizeof(buffer)); + guard(mutex)(&data->lock); /* Burst read data registers */ -- 2.53.0