From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELtP/mQi/whUNmVI7rE4sPCJD1Nz57FaKPyUWDQq+CXax9hbfC37vSiXeRr5dDsnbJrmKIj/ ARC-Seal: i=1; a=rsa-sha256; t=1519676569; cv=none; d=google.com; s=arc-20160816; b=GU8otIl8/CWZ3qhkxwsir1/1RLZ72XhX0IIc2HHm33FOGeR4naNFpnWIe96r879OFk nECGRX4btGDJEsAZcEy7FMVYx5a+fwW1GN61YRGVEL3OpH2DpgSo3WH2bURRxJTTXwGS pTx86JCRCvS9B2IARIEggrWE8MuEZvUPbGihvKazVGdSiaTZm+pz8hR/wjMudjyUeOQf Jg+ABe1PrKSjdEnjQtk+8ZsJWtdfGYHS8cTvCbnq3qhcAwWLKMNHZYPUuHfRtGC7sWCU bM8JanDct40qTWTnxnSl8+Qf8KJrliLSsDxFDvPSttMacSNiCIIcdXSG3uxnjbN1EhC8 4Y/g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=CNc5RtQf+jf9V6AALc/Xiti2eexPaIHh0fS9xxF+itE=; b=SCpF8F9Z0NDpglNAznNn8KDG999Z2Na218QhC/ONeO/grt+fqrtoZR88yCqOOkLWP8 sV3PiBkMhemp7LP0zWK+9oMEVOM/jQMCr6rjAjDXagiUPUBUwSuWRVAadxGf5waLNAg6 z26GKq3JU6Jt5O85XfbLaCelsTC7wQAmyHmLYQQjEsgFKs9YssXHFT65i8FRnTfY1Vdz FAI26LE3+k0R8soUWCucVmpUElMp753fDWhenK8uIlBiU7BdfxB+tnAczZd3cJa3spW0 W0oSxrkjOKqRx+Tw3rdFAPx4+uoOZkUtGyoTQW7L/3874sL5XVbmiQOlaB2aRj21p1TU JFjA== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 83.175.124.243 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 83.175.124.243 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stefan Windfeldt-Prytz , Jonathan Cameron Subject: [PATCH 4.9 08/39] iio: buffer: check if a buffer has been set up when poll is called Date: Mon, 26 Feb 2018 21:20:29 +0100 Message-Id: <20180226201644.041990353@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180226201643.660109883@linuxfoundation.org> References: <20180226201643.660109883@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1593495967737475956?= X-GMAIL-MSGID: =?utf-8?q?1593496378463371142?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stefan Windfeldt-Prytz commit 4cd140bda6494543f1c1b0ccceceaa44b676eef6 upstream. If no iio buffer has been set up and poll is called return 0. Without this check there will be a null pointer dereference when calling poll on a iio driver without an iio buffer. Cc: stable@vger.kernel.org Signed-off-by: Stefan Windfeldt-Prytz Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/industrialio-buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -174,7 +174,7 @@ unsigned int iio_buffer_poll(struct file struct iio_dev *indio_dev = filp->private_data; struct iio_buffer *rb = indio_dev->buffer; - if (!indio_dev->info) + if (!indio_dev->info || rb == NULL) return 0; poll_wait(filp, &rb->pollq, wait);