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[2001:14ba:16f3:4a00::4]) by smtp.gmail.com with ESMTPSA id bi19-20020a05651c231300b00261b4df9ec4sm240535ljb.138.2022.10.14.00.15.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Oct 2022 00:15:37 -0700 (PDT) Date: Fri, 14 Oct 2022 10:15:19 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Jonathan Cameron , Lars-Peter Clausen , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] =?iso-8859-1?q?=A7tools=3A?= iio: iio_generic_buffer: Fix read size Message-ID: MIME-Version: 1.0 Content-Disposition: inline X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1746646571698237553?= X-GMAIL-MSGID: =?utf-8?q?1746646571698237553?= When noevents is true and small buffer is used the allocated memory for holding the data may be smaller than the hard-coded 64 bytes. This can cause the iio_generic_buffer to crash. Following was recorded on beagle bone black with v6.0 kernel and the digit fix patch: https://lore.kernel.org/all/Y0f+tKCz+ZAIoroQ@dc75zzyyyyyyyyyyyyycy-3.rev.dnainternet.fi/ using valgrind; ==339== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info ==339== Command: /iio_generic_buffer -n kx022-accel -T0 -e -l 10 -a -w 2000000 ==339== Parent PID: 307 ==339== ==339== Syscall param read(buf) points to unaddressable byte(s) ==339== at 0x496BFA4: read (read.c:26) ==339== by 0x11699: main (iio_generic_buffer.c:724) ==339== Address 0x4ab3518 is 0 bytes after a block of size 160 alloc'd ==339== at 0x4864B70: malloc (vg_replace_malloc.c:381) ==339== by 0x115BB: main (iio_generic_buffer.c:677) Fix this by always using the same size for reading as was used for data storage allocation. Signed-off-by: Matti Vaittinen --- This patch has been only tested with my kx022a sensor driver. Driver may have some culprits(s) and my understanding regarding IIO and these tools is limited so perhaps the hard-coded size of 64 bytes has perfectly legitimate reason - in which case I would appreciate to hear the reasoning so I could seek the problem from my driver. Also, I didn't add the fixes-tag as I don't really know which commit has caused the problem - as I am not 100% sure what the problem actually is and if I am just fixing a symptom here. --- tools/iio/iio_generic_buffer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) base-commit: 4fe89d07dcc2804c8b562f6c7896a45643d34b2f diff --git a/tools/iio/iio_generic_buffer.c b/tools/iio/iio_generic_buffer.c index 2491c54a5e4f..f8deae4e26a1 100644 --- a/tools/iio/iio_generic_buffer.c +++ b/tools/iio/iio_generic_buffer.c @@ -715,12 +715,12 @@ int main(int argc, char **argv) continue; } - toread = buf_len; } else { usleep(timedelay); - toread = 64; } + toread = buf_len; + read_size = read(buf_fd, data, toread * scan_size); if (read_size < 0) { if (errno == EAGAIN) {