diff options
| author | Kent Gibson <warthog618@gmail.com> | 2020-09-28 02:27:49 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2020-09-30 10:56:27 +0200 |
| commit | 69e4e1368803266d0e06dba86868f64f7b277cde (patch) | |
| tree | 6aa889fff1d2424090eac673aa9e018da76f7aab /drivers/gpio | |
| parent | gpiolib: cdev: gpio_desc_to_lineinfo() should set info offset (diff) | |
| download | linux-69e4e1368803266d0e06dba86868f64f7b277cde.tar.xz linux-69e4e1368803266d0e06dba86868f64f7b277cde.zip | |
gpiolib: cdev: replace strncpy() with strscpy()
Replace usage of strncpy() with strscpy() to remove -Wstringop-truncation
warnings.
The structures being populated are zeroed, to prevent stack leakage as
they are returned to userspace, so strscpy() performs the equivalent
function without the warnings.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-cdev.c | 23 |
1 files changed, 7 insertions, 16 deletions
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index 81ce2020f17b..86679397d09c 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -752,6 +752,7 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc, bool ok_for_pinctrl; unsigned long flags; + memset(info, 0, sizeof(*info)); info->line_offset = gpio_chip_hwgpio(desc); /* @@ -766,19 +767,11 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc, spin_lock_irqsave(&gpio_lock, flags); - if (desc->name) { - strncpy(info->name, desc->name, sizeof(info->name)); - info->name[sizeof(info->name) - 1] = '\0'; - } else { - info->name[0] = '\0'; - } + if (desc->name) + strscpy(info->name, desc->name, sizeof(info->name)); - if (desc->label) { - strncpy(info->consumer, desc->label, sizeof(info->consumer)); - info->consumer[sizeof(info->consumer) - 1] = '\0'; - } else { - info->consumer[0] = '\0'; - } + if (desc->label) + strscpy(info->consumer, desc->label, sizeof(info->consumer)); /* * Userspace only need to know that the kernel is using this GPIO so @@ -842,12 +835,10 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg) memset(&chipinfo, 0, sizeof(chipinfo)); - strncpy(chipinfo.name, dev_name(&gdev->dev), + strscpy(chipinfo.name, dev_name(&gdev->dev), sizeof(chipinfo.name)); - chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; - strncpy(chipinfo.label, gdev->label, + strscpy(chipinfo.label, gdev->label, sizeof(chipinfo.label)); - chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; chipinfo.lines = gdev->ngpio; if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) return -EFAULT; |