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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id y3sm2684831pfb.132.2020.05.06.14.15.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 May 2020 14:15:29 -0700 (PDT) From: Kees Cook To: Pavel Tatashin Cc: Kees Cook , Anton Vorontsov , Colin Cross , Tony Luck , Jonathan Corbet , Rob Herring , Benson Leung , Enric Balletbo i Serra , Petr Mladek , Sergey Senozhatsky , Steven Rostedt , jmorris@namei.org, sashal@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v3 3/6] pstore/ram: Refactor DT size parsing Date: Wed, 6 May 2020 14:15:20 -0700 Message-Id: <20200506211523.15077-4-keescook@chromium.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200506211523.15077-1-keescook@chromium.org> References: <20200506211523.15077-1-keescook@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Refactor device tree size parsing routines to be able to pass a non-zero default value for providing a configurable default for the coming "max_reason" field. Signed-off-by: Kees Cook --- fs/pstore/ram.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index 795622190c01..c2f76b650f91 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -645,18 +645,23 @@ static int ramoops_init_prz(const char *name, } static int ramoops_parse_dt_size(struct platform_device *pdev, - const char *propname, u32 *value) + const char *propname, + u32 default_value, u32 *value) { u32 val32 = 0; int ret; ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); - if (ret < 0 && ret != -EINVAL) { + if (ret == -EINVAL) { + /* field is missing, use default value. */ + val32 = default_value; + } else if (ret < 0) { dev_err(&pdev->dev, "failed to parse property %s: %d\n", propname, ret); return ret; } + /* Sanity check our results. */ if (val32 > INT_MAX) { dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); return -EOVERFLOW; @@ -689,19 +694,20 @@ static int ramoops_parse_dt(struct platform_device *pdev, pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); -#define parse_size(name, field) { \ - ret = ramoops_parse_dt_size(pdev, name, &value); \ +#define parse_size(name, field, default_value) { \ + ret = ramoops_parse_dt_size(pdev, name, default_value, \ + &value); \ if (ret < 0) \ return ret; \ field = value; \ } - parse_size("record-size", pdata->record_size); - parse_size("console-size", pdata->console_size); - parse_size("ftrace-size", pdata->ftrace_size); - parse_size("pmsg-size", pdata->pmsg_size); - parse_size("ecc-size", pdata->ecc_info.ecc_size); - parse_size("flags", pdata->flags); + parse_size("record-size", pdata->record_size, 0); + parse_size("console-size", pdata->console_size, 0); + parse_size("ftrace-size", pdata->ftrace_size, 0); + parse_size("pmsg-size", pdata->pmsg_size, 0); + parse_size("ecc-size", pdata->ecc_info.ecc_size, 0); + parse_size("flags", pdata->flags, 0); #undef parse_size -- 2.20.1