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Received: from IA1PR12MB7736.namprd12.prod.outlook.com (2603:10b6:208:420::15) by SJ5PPFF62310189.namprd12.prod.outlook.com (2603:10b6:a0f:fc02::9a9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9891.18; Tue, 12 May 2026 14:22:04 +0000 Received: from IA1PR12MB7736.namprd12.prod.outlook.com ([fe80::2274:9fed:8f3:8550]) by IA1PR12MB7736.namprd12.prod.outlook.com ([fe80::2274:9fed:8f3:8550%6]) with mapi id 15.20.9891.021; Tue, 12 May 2026 14:22:04 +0000 Message-ID: <46bcd2ce-bfb4-4fc3-b840-dba657f39a7f@amd.com> Date: Tue, 12 May 2026 15:22:01 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/3] iio: adc: xilinx-ams: fix out-of-bounds channel lookup in event handling To: Guilherme Ivo Bozi , Conall O'Griofa , Jonathan Cameron , Michal Simek Cc: David Lechner , =?UTF-8?Q?Nuno_S=C3=A1?= , Andy Shevchenko , linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260414224245.8493-1-guilherme.bozi@usp.br> <20260414224245.8493-2-guilherme.bozi@usp.br> Content-Language: en-US From: Salih Erim In-Reply-To: <20260414224245.8493-2-guilherme.bozi@usp.br> Content-Type: text/plain; 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On 4/14/2026 11:40 PM, Guilherme Ivo Bozi wrote: > 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; > + The added lines use spaces for indentation instead of tabs. Salih