commit 99ec303e459ea4ded9981337e10651aee08016b0
author Marco Nelissen <marcone@google.com> Mon Dec 17 10:28:20 2012 -0800
committer Alex Ray <aray@google.com> Tue Jul 30 13:57:00 2013 -0700
tree 16b4d6509b01885efce0b91516c339cbfed5bddb
parent 551fcf4fe39e68fab17d56cc6c4b8a61164891ff

Add NULL check to CallStack::toString

CallStack::toString() has a 0 default argument, which ends up getting
passed to strlen(), resulting in a crash.

Change-Id: If706aff8c400983670f49cdbb66e11191ac76e0e

libs/utils/CallStack.cpp

diff --git a/libs/utils/CallStack.cpp b/libs/utils/CallStack.cpp
index 18fd84f..66fabeb 100644
--- a/libs/utils/CallStack.cpp
+++ b/libs/utils/CallStack.cpp
@@ -118,7 +118,9 @@
         char line[MAX_BACKTRACE_LINE_LENGTH];
         format_backtrace_line(i, &mStack[i], &symbols[i],
                 line, MAX_BACKTRACE_LINE_LENGTH);
-        str.append(prefix);
+        if (prefix) {
+            str.append(prefix);
+        }
         str.append(line);
         str.append("\n");
     }