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Tue, 12 May 2026 17:35:18 -0700 (PDT) Received: from gui-host.Dlink ([177.140.77.53]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2f91004b6a2sm18471381eec.0.2026.05.12.17.35.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 May 2026 17:35:17 -0700 (PDT) From: Guilherme Ivo Bozi To: anand.ashok.dumbre@xilinx.com, andy@kernel.org, conall.ogriofa@amd.com, dlechner@baylibre.com, jic23@kernel.org, manish.narani@xilinx.com, michal.simek@amd.com, nuno.sa@analog.com, salih.erim@amd.com Cc: Guilherme Ivo Bozi , Jonathan.Cameron@huawei.com, linux-arm-kernel@lists.infradead.org, linux-iio@vger.kernel.org Subject: [PATCH v4 1/3] iio: adc: xilinx-ams: fix out-of-bounds channel lookup in event handling Date: Tue, 12 May 2026 21:31:50 -0300 Message-ID: <20260513003503.339418-2-guilherme.bozi@usp.br> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260513003503.339418-1-guilherme.bozi@usp.br> References: <20260513003503.339418-1-guilherme.bozi@usp.br> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260512_173519_117593_3DF4C298 X-CRM114-Status: GOOD ( 11.75 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org ams_event_to_channel() may return a pointer past the end of dev->channels when no matching scan_index is found. This can lead to invalid memory access in ams_handle_event(). Add a bounds check in ams_event_to_channel() and return NULL when no channel is found. Also guard the caller to safely handle this case. Fixes: d5c70627a794 ("iio: adc: Add Xilinx AMS driver") Signed-off-by: Guilherme Ivo Bozi --- drivers/iio/adc/xilinx-ams.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/iio/adc/xilinx-ams.c b/drivers/iio/adc/xilinx-ams.c index 124470c92529..6191cd1b29a5 100644 --- a/drivers/iio/adc/xilinx-ams.c +++ b/drivers/iio/adc/xilinx-ams.c @@ -871,6 +871,9 @@ static const struct iio_chan_spec *ams_event_to_channel(struct iio_dev *dev, if (dev->channels[i].scan_index == scan_index) break; + if (i == dev->num_channels) + return NULL; + return &dev->channels[i]; } @@ -1012,6 +1015,8 @@ static void ams_handle_event(struct iio_dev *indio_dev, u32 event) const struct iio_chan_spec *chan; chan = ams_event_to_channel(indio_dev, event); + if (!chan) + return; if (chan->type == IIO_TEMP) { /* -- 2.47.3