[PATCH] libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc: Avoid writing '\0' out of string's border

[Chen Gang]

'max_len' is the maximized length of 'name', so for writing '\0' to
"name[max_len]", it is out of string's border, need use "max_len - 1"
instead of.

Pass normal test suite: "configure && make && make check && compare",
I guess, at present, it is not really used by outside, though.

2014-08-27  Chen Gang  <gang.chen.5...@gmail.com>

        * sanitizer_common/sanitizer_linux_libcdep.cc
        (SanitizerGetThreadName): Avoid writing '\0' out of string's
        border
---
 libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc 
b/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc
index e754b26..b9089d5 100644
--- a/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc
+++ b/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc
@@ -140,7 +140,7 @@ bool SanitizerGetThreadName(char *name, int max_len) {
   if (prctl(PR_GET_NAME, (unsigned long)buff, 0, 0, 0))  // NOLINT
     return false;
   internal_strncpy(name, buff, max_len);
-  name[max_len] = 0;
+  name[max_len - 1] = 0;
   return true;
 #else
   return false;
-- 
1.9.3