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[106.68.217.148]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84154e02781sm720267b3a.32.2026.05.21.01.59.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 May 2026 01:59:50 -0700 (PDT) Date: Thu, 21 May 2026 16:59:45 +0800 From: Kent Gibson To: Bartosz Golaszewski Cc: Bartosz Golaszewski , Linus Walleij , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3] gpio: cdev: check if uAPI v2 config attributes are correctly zeroed Message-ID: <20260521085945.GA59870@rigel> References: <20260521-gpio-cdev-attr-padding-check-v3-1-ec3bcbe2e358@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260521-gpio-cdev-attr-padding-check-v3-1-ec3bcbe2e358@oss.qualcomm.com> On Thu, May 21, 2026 at 10:42:16AM +0200, Bartosz Golaszewski wrote: > We check the padding of other uAPI v2 structures but not that of line > config attributes. For used attributes: check if their padding is > zeroed, for unused: check if the entire structure is zeroed. > > Fixes: 3c0d9c635ae2 ("gpiolib: cdev: support GPIO_V2_GET_LINE_IOCTL and GPIO_V2_LINE_GET_VALUES_IOCTL") > Signed-off-by: Bartosz Golaszewski Reviewed-by: Kent Gibson > --- > Changes in v3: > - Don't try to check unused attributes if there are none > - Don't reuse the loop iterator from the attribute padding check > - Link to v2: https://patch.msgid.link/20260520-gpio-cdev-attr-padding-check-v2-1-0010daf8059f@oss.qualcomm.com > > Changes in v2: > - Make checking even stricter: check if padding is zeroed for used > attributes, for unused ones: check if the entire struct is zeroed > - Link to v1: https://patch.msgid.link/20260519-gpio-cdev-attr-padding-check-v1-1-a0c6d4a698bf@oss.qualcomm.com > --- > drivers/gpio/gpiolib-cdev.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c > index f36b7c06996d70b2286edbd181899e4c572b9086..82f27db0b2304679eae4c4f28302e9845d7cbaa3 100644 > --- a/drivers/gpio/gpiolib-cdev.c > +++ b/drivers/gpio/gpiolib-cdev.c > @@ -1184,6 +1184,7 @@ static int gpio_v2_line_flags_validate(u64 flags) > static int gpio_v2_line_config_validate(struct gpio_v2_line_config *lc, > unsigned int num_lines) > { > + size_t unused_attrs; > unsigned int i; > u64 flags; > int ret; > @@ -1191,9 +1192,21 @@ static int gpio_v2_line_config_validate(struct gpio_v2_line_config *lc, > if (lc->num_attrs > GPIO_V2_LINE_NUM_ATTRS_MAX) > return -EINVAL; > > + unused_attrs = GPIO_V2_LINE_NUM_ATTRS_MAX - lc->num_attrs; > + > if (!mem_is_zero(lc->padding, sizeof(lc->padding))) > return -EINVAL; > > + for (i = 0; i < lc->num_attrs; i++) { > + if (lc->attrs[i].attr.padding != 0) > + return -EINVAL; > + } > + > + if (unused_attrs) { > + if (!mem_is_zero(&lc->attrs[lc->num_attrs], unused_attrs * sizeof(*lc->attrs))) > + return -EINVAL; > + } > + > for (i = 0; i < num_lines; i++) { > flags = gpio_v2_line_config_flags(lc, i); > ret = gpio_v2_line_flags_validate(flags); > > --- > base-commit: 6a50ba100ace43f43c87384367eb2d2605fcc16c > change-id: 20260519-gpio-cdev-attr-padding-check-7e52c98a3de7 > > Best regards, > -- > Bartosz Golaszewski >