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[125.239.144.11]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71e5d1d396bsm3502968b3a.33.2024.10.14.13.59.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Oct 2024 13:59:57 -0700 (PDT) Date: Tue, 15 Oct 2024 09:59:49 +1300 From: Paulo Miguel Almeida To: tsbogend@alpha.franken.de, gregkh@linuxfoundation.org, zhanggenjian@kylinos.cn, ricardo@marliere.net, bvanassche@acm.org, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org Cc: paulo.miguel.almeida.rodenas@gmail.com, linux-hardening@vger.kernel.org Subject: [PATCH][next] mips: sgi-ip22: Replace "s[n]?printf" with sysfs_emit in sysfs callbacks Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" snprintf() has the documented, but still rather strange trait of returning the length of the data that *would have been* written to the array if space were available, rather than the arguably more useful length of data *actually* written, it is usually considered wise to use scnprintf()/vscnprintf() instead. In the case of sysfs call-backs, new wrappers exist that do just that while also being PAGE_SIZE aware This patch updates the sysfs .show() callbacks to use the sysfs_emit() helper instead of snprintf() and sprintf(). Link: https://lwn.net/Articles/69419/ Link: https://github.com/KSPP/linux/issues/105 Signed-off-by: Paulo Miguel Almeida --- arch/mips/sgi-ip22/ip22-gio.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/mips/sgi-ip22/ip22-gio.c b/arch/mips/sgi-ip22/ip22-gio.c index d20eec742bfa..5893ea4e382c 100644 --- a/arch/mips/sgi-ip22/ip22-gio.c +++ b/arch/mips/sgi-ip22/ip22-gio.c @@ -165,9 +165,8 @@ static ssize_t modalias_show(struct device *dev, struct= device_attribute *a, char *buf) { struct gio_device *gio_dev =3D to_gio_device(dev); - int len =3D snprintf(buf, PAGE_SIZE, "gio:%x\n", gio_dev->id.id); =20 - return (len >=3D PAGE_SIZE) ? (PAGE_SIZE - 1) : len; + return sysfs_emit(buf, "gio:%x\n", gio_dev->id.id); } static DEVICE_ATTR_RO(modalias); =20 @@ -177,7 +176,7 @@ static ssize_t name_show(struct device *dev, struct gio_device *giodev; =20 giodev =3D to_gio_device(dev); - return sprintf(buf, "%s", giodev->name); + return sysfs_emit(buf, "%s\n", giodev->name); } static DEVICE_ATTR_RO(name); =20 @@ -187,7 +186,7 @@ static ssize_t id_show(struct device *dev, struct gio_device *giodev; =20 giodev =3D to_gio_device(dev); - return sprintf(buf, "%x", giodev->id.id); + return sysfs_emit(buf, "%x\n", giodev->id.id); } static DEVICE_ATTR_RO(id); =20 --=20 2.47.0