Prevent NULL pointer access via implicit conversion

Prevent implicit conversion of a NULL char* to AString in MediaCodecInfo,
and make AString itself more robust.

Bug: 26385693
Change-Id: I4b6185bdf7c3390d571c71e94fd531bafc3f813e
diff --git a/media/libmedia/MediaCodecInfo.cpp b/media/libmedia/MediaCodecInfo.cpp
index 06abd8d..fea29da 100644
--- a/media/libmedia/MediaCodecInfo.cpp
+++ b/media/libmedia/MediaCodecInfo.cpp
@@ -119,9 +119,11 @@
 }
 
 bool MediaCodecInfo::hasQuirk(const char *name) const {
-    for (size_t ix = 0; ix < mQuirks.size(); ix++) {
-        if (mQuirks.itemAt(ix).equalsIgnoreCase(name)) {
-            return true;
+    if (name) {
+        for (size_t ix = 0; ix < mQuirks.size(); ix++) {
+            if (mQuirks.itemAt(ix).equalsIgnoreCase(name)) {
+                return true;
+            }
         }
     }
     return false;
@@ -186,9 +188,11 @@
 }
 
 ssize_t MediaCodecInfo::getCapabilityIndex(const char *mime) const {
-    for (size_t ix = 0; ix < mCaps.size(); ix++) {
-        if (mCaps.keyAt(ix).equalsIgnoreCase(mime)) {
-            return ix;
+    if (mime) {
+        for (size_t ix = 0; ix < mCaps.size(); ix++) {
+            if (mCaps.keyAt(ix).equalsIgnoreCase(mime)) {
+                return ix;
+            }
         }
     }
     return -1;
diff --git a/media/libstagefright/foundation/AString.cpp b/media/libstagefright/foundation/AString.cpp
index b167543..04fac19 100644
--- a/media/libstagefright/foundation/AString.cpp
+++ b/media/libstagefright/foundation/AString.cpp
@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+#define LOG_TAG "AString"
+#include <utils/Log.h>
+
 #include <ctype.h>
 #include <stdarg.h>
 #include <stdio.h>
@@ -40,14 +43,24 @@
     : mData(NULL),
       mSize(0),
       mAllocSize(1) {
-    setTo(s);
+    if (!s) {
+        ALOGW("ctor got NULL, using empty string instead");
+        clear();
+    } else {
+        setTo(s);
+    }
 }
 
 AString::AString(const char *s, size_t size)
     : mData(NULL),
       mSize(0),
       mAllocSize(1) {
-    setTo(s, size);
+    if (!s) {
+        ALOGW("ctor got NULL, using empty string instead");
+        clear();
+    } else {
+        setTo(s, size);
+    }
 }
 
 AString::AString(const String8 &from)