use clamp_t in UNAME26 fix

commit 31fd84b95eb211d5db460a1dda85e004800a7b52 upstream.

The min/max call needed to have explicit types on some architectures
(e.g. mn10300). Use clamp_t instead to avoid the warning:

  kernel/sys.c: In function 'override_release':
  kernel/sys.c:1287:10: warning: comparison of distinct pointer types lacks a cast [enabled by default]

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/kernel/sys.c b/kernel/sys.c
index d7c4ab0..f5939c2 100644 (file)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1190,7 +1190,7 @@ static int override_release(char __user *release, size_t len)
                        rest++;
                }
                v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40;
-               copy = min(sizeof(buf), max_t(size_t, 1, len));
+               copy = clamp_t(size_t, len, 1, sizeof(buf));
                copy = scnprintf(buf, copy, "2.6.%u%s", v, rest);
                ret = copy_to_user(release, buf, copy + 1);
        }