From: Dan Carpenter Date: Fri, 14 Oct 2016 07:34:18 +0000 (+0300) Subject: ntb_perf: potential info leak in debugfs X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=819baf885953b588b63bef28e5598daf9ed4ddf9;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git ntb_perf: potential info leak in debugfs This is a static checker warning, not something I'm desperately concerned about. But snprintf() returns the number of bytes that would have been copied if there were space. We really care about the number of bytes that actually were copied so we should use scnprintf() instead. It probably won't overrun, and in that case we may as well just use sprintf() but these sorts of things make static checkers and code reviewers happier. Signed-off-by: Dan Carpenter Acked-by: Dave Jiang Signed-off-by: Jon Mason --- diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c index e065b695200d..e75d4fdc0866 100644 --- a/drivers/ntb/test/ntb_perf.c +++ b/drivers/ntb/test/ntb_perf.c @@ -589,7 +589,7 @@ static ssize_t debugfs_run_read(struct file *filp, char __user *ubuf, return -ENOMEM; if (mutex_is_locked(&perf->run_mutex)) { - out_off = snprintf(buf, 64, "running\n"); + out_off = scnprintf(buf, 64, "running\n"); goto read_from_buf; } @@ -600,14 +600,14 @@ static ssize_t debugfs_run_read(struct file *filp, char __user *ubuf, break; if (pctx->status) { - out_off += snprintf(buf + out_off, 1024 - out_off, + out_off += scnprintf(buf + out_off, 1024 - out_off, "%d: error %d\n", i, pctx->status); continue; } rate = div64_u64(pctx->copied, pctx->diff_us); - out_off += snprintf(buf + out_off, 1024 - out_off, + out_off += scnprintf(buf + out_off, 1024 - out_off, "%d: copied %llu bytes in %llu usecs, %llu MBytes/s\n", i, pctx->copied, pctx->diff_us, rate); }