Merge cherrypicks of [2937968, 2940489, 2939606, 2939607, 2940434, 2940435,...

Merge cherrypicks of [2937968, 2940489, 2939606, 2939607, 2940434, 2940435, 2940436, 2940437, 2940509, 2940510, 2940118, 2940119, 2940120, 2940121, 2940122, 2938726, 2938728, 2940550, 2940552, 2940554, 2940556, 2940511, 2940512, 2940513, 2940514, 2940515, 2940558, 2940649, 2940650, 2940441, 2940442, 2940559, 2940560, 2940561, 2940562, 2940563, 2940564, 2938336, 2940565, 2940566, 2940516, 2940443, 2940517, 2940444, 2940445] into oc-dr1-release

Change-Id: I63e94e2e1bdd2a2748fdc1df70db3e439e806862

libutils/Unicode.cpp

@@ -180,7 +180,15 @@ ssize_t utf32_to_utf8_length(const char32_t *src, size_t src_len)
     size_t ret = 0;
     const char32_t *end = src + src_len;
     while (src < end) {
-        ret += utf32_codepoint_utf8_length(*src++);
+        size_t char_len = utf32_codepoint_utf8_length(*src++);
+        if (SSIZE_MAX - char_len < ret) {
+            // If this happens, we would overflow the ssize_t type when
+            // returning from this function, so we cannot express how
+            // long this string is in an ssize_t.
+            android_errorWriteLog(0x534e4554, "37723026");
+            return -1;
+        }
+        ret += char_len;
     }
     return ret;
 }
@@ -440,14 +448,23 @@ ssize_t utf16_to_utf8_length(const char16_t *src, size_t src_len)
     size_t ret = 0;
     const char16_t* const end = src + src_len;
     while (src < end) {
+        size_t char_len;
         if ((*src & 0xFC00) == 0xD800 && (src + 1) < end
                 && (*(src + 1) & 0xFC00) == 0xDC00) {
             // surrogate pairs are always 4 bytes.
-            ret += 4;
+            char_len = 4;
             src += 2;
         } else {
-            ret += utf32_codepoint_utf8_length((char32_t) *src++);
+            char_len = utf32_codepoint_utf8_length((char32_t)*src++);
+        }
+        if (SSIZE_MAX - char_len < ret) {
+            // If this happens, we would overflow the ssize_t type when
+            // returning from this function, so we cannot express how
+            // long this string is in an ssize_t.
+            android_errorWriteLog(0x534e4554, "37723026");
+            return -1;
         }
+        ret += char_len;
     }
     return ret;
 }