From patchwork Fri Sep 2 12:29:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cezary Rojewski X-Patchwork-Id: 12964091 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5255AC38145 for ; Fri, 2 Sep 2022 12:21:16 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 10332161E; Fri, 2 Sep 2022 14:20:25 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 10332161E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1662121275; bh=iito/a+ymZLPMsxae6Mq4cZS1ef+cun+eIfLQGc3m4I=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=bbLCNwmM2KG/hLB9JIcoYTjgXnUDcD7jdVc/84sqmToZBlIP6HhxndnP/68rkm2+/ Vhe5GXDUilRjQBfYa8lXMrR6hCKSAf7m0G/YG3iCfMgaooTe9PoXJDhkPU25m883tX pmq+wSylnyBnRyH/QJ4IAGkyB0fLfi00S2DoEbDY= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 58B72F804E6; Fri, 2 Sep 2022 14:20:05 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 1833FF804E6; Fri, 2 Sep 2022 14:20:03 +0200 (CEST) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 6110DF80163 for ; Fri, 2 Sep 2022 14:19:55 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 6110DF80163 Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="IjL+g17T" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1662121197; x=1693657197; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=iito/a+ymZLPMsxae6Mq4cZS1ef+cun+eIfLQGc3m4I=; b=IjL+g17TqU8K9eQDW77bR3z7qTH1LgmnSSWhMb7GjZcpIRRSQ82vU1+B OpSjW00RczaroCjf1mToYM8oZPM8x0gbTtTNINEF3RqhN5TZ1WXQjCqOi yginHSamEIGwnmsgSsEXp9EAD0ZN10v8c7uB5w8ElsIT1cJo38+qhRm5A k9zFmGd7kenPy6w766WaDzP37EIM/XeeAiBimwjWVBwJV6s3Cljxp5GYV pEr4DXHUeycm8cyk+2jx+eABqTYW55Wamr6E1PHny2sMX//6mONR6zykA cZoA3Ji9Bh8pdkp9IDFKP/JvmoqRQZLQVVHZ8z32LBF22rcTEGjrcMxw0 A==; X-IronPort-AV: E=McAfee;i="6500,9779,10457"; a="278984253" X-IronPort-AV: E=Sophos;i="5.93,283,1654585200"; d="scan'208";a="278984253" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Sep 2022 05:19:53 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,283,1654585200"; d="scan'208";a="563946995" Received: from crojewsk-ctrl.igk.intel.com ([10.102.9.28]) by orsmga003.jf.intel.com with ESMTP; 02 Sep 2022 05:19:49 -0700 From: Cezary Rojewski To: alsa-devel@alsa-project.org, broonie@kernel.org Subject: [PATCH v4 1/2] lib/string_helpers: Introduce parse_int_array_user() Date: Fri, 2 Sep 2022 14:29:27 +0200 Message-Id: <20220902122928.632602-2-cezary.rojewski@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220902122928.632602-1-cezary.rojewski@intel.com> References: <20220902122928.632602-1-cezary.rojewski@intel.com> MIME-Version: 1.0 Cc: andy@kernel.org, Cezary Rojewski , intel-poland@eclists.intel.com, kai.vehmanen@linux.intel.com, yung-chuan.liao@linux.intel.com, tiwai@suse.com, pierre-louis.bossart@linux.intel.com, willy@infradead.org, lgirdwood@gmail.com, hdegoede@redhat.com, andy.shevchenko@gmail.com, ranjani.sridharan@linux.intel.com, amadeuszx.slawinski@linux.intel.com, peter.ujfalusi@linux.intel.com, linux-kernel@vger.kernel.org X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" Add new helper function to allow for splitting specified user string into a sequence of integers. Internally it makes use of get_options() so the returned sequence contains the integers extracted plus an additional element that begins the sequence and specifies the integers count. Suggested-by: Andy Shevchenko Reviewed-by: Andy Shevchenko Signed-off-by: Cezary Rojewski --- include/linux/string_helpers.h | 2 ++ lib/string_helpers.c | 45 ++++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+) diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h index 4d72258d42fd..dc2e726fd820 100644 --- a/include/linux/string_helpers.h +++ b/include/linux/string_helpers.h @@ -21,6 +21,8 @@ enum string_size_units { void string_get_size(u64 size, u64 blk_size, enum string_size_units units, char *buf, int len); +int parse_int_array_user(const char __user *from, size_t count, int **array); + #define UNESCAPE_SPACE BIT(0) #define UNESCAPE_OCTAL BIT(1) #define UNESCAPE_HEX BIT(2) diff --git a/lib/string_helpers.c b/lib/string_helpers.c index 5ed3beb066e6..d0c8f6ecf84c 100644 --- a/lib/string_helpers.c +++ b/lib/string_helpers.c @@ -131,6 +131,51 @@ void string_get_size(u64 size, u64 blk_size, const enum string_size_units units, } EXPORT_SYMBOL(string_get_size); +/** + * parse_int_array_user - Split string into a sequence of integers + * @from: The user space buffer to read from + * @ppos: The current position in the buffer + * @count: The maximum number of bytes to read + * @tkns: Returned pointer to sequence of integers + * + * On success @tkns is allocated and initialized with a sequence of + * integers extracted from the @from plus an additional element that + * begins the sequence and specifies the integers count. + * + * Caller takes responsibility for freeing @tkns when it is no longer + * needed. + */ +int parse_int_array_user(const char __user *from, size_t count, int **array) +{ + int *ints, nints; + char *buf; + int ret = 0; + + buf = memdup_user_nul(from, count); + if (IS_ERR(buf)) + return PTR_ERR(buf); + + get_options(buf, 0, &nints); + if (!nints) { + ret = -ENOENT; + goto free_buf; + } + + ints = kcalloc(nints + 1, sizeof(*ints), GFP_KERNEL); + if (!ints) { + ret = -ENOMEM; + goto free_buf; + } + + get_options(buf, nints + 1, ints); + *array = ints; + +free_buf: + kfree(buf); + return ret; +} +EXPORT_SYMBOL(parse_int_array_user); + static bool unescape_space(char **src, char **dst) { char *p = *dst, *q = *src;