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SubjectRe: [PATCH] iio: gyro: adis16136: use scnprintf instead of snprintf
On Wed, Mar 18, 2020 at 08:25:22PM +0530, Rohit Sarkar wrote:
> scnprintf returns the actual number of bytes written into the buffer as
> opposed to snprintf which returns the number of bytes that would have
> been written if the buffer was big enough. Using the output of snprintf
> may lead to difficult to detect bugs.

Nice. Have you investigate the code?

> @@ -96,7 +96,7 @@ static ssize_t adis16136_show_serial(struct file *file,
> if (ret)
> return ret;
>
> - len = snprintf(buf, sizeof(buf), "%.4x%.4x%.4x-%.4x\n", lot1, lot2,
> + len = scnprintf(buf, sizeof(buf), "%.4x%.4x%.4x-%.4x\n", lot1, lot2,
> lot3, serial);
>
> return simple_read_from_buffer(userbuf, count, ppos, buf, len);

The buffer size is 20, the pattern size I count to 19. Do you think snprintf()
can fail?

--
With Best Regards,
Andy Shevchenko


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