From: Kees Cook <keescook@chromium.org>
Date: Sat, 20 Oct 2012 01:45:53 +0000 (-0700)
Subject: use clamp_t in UNAME26 fix
X-Git-Tag: v3.0.49~24
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2f3dc85d233fce3345eb1880ec44349d7b290211;p=karo-tx-linux.git

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/kernel/sys.c b/kernel/sys.c
index 46ca435564c4..84e353b1820d 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1152,7 +1152,7 @@ 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);
 	}