audio policy: validate stream type received from binder calls.

Bug: 18001784.
Bug: 18002005.
Change-Id: I8efa674dceff5a6e10251b1c7a55e9bb2d532395
(cherry picked from commit dea1541fc0042abf05674b19c2f94ca086945dfd)

services/audiopolicy/AudioPolicyInterfaceImpl.cpp

diff --git a/services/audiopolicy/AudioPolicyInterfaceImpl.cpp b/services/audiopolicy/AudioPolicyInterfaceImpl.cpp
index dceda97..be3c5ad 100644
--- a/services/audiopolicy/AudioPolicyInterfaceImpl.cpp
+++ b/services/audiopolicy/AudioPolicyInterfaceImpl.cpp
@@ -129,6 +129,9 @@
                                     audio_output_flags_t flags,
                                     const audio_offload_info_t *offloadInfo)
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mAudioPolicyManager == NULL) {
         return 0;
     }
@@ -158,6 +161,9 @@
                                          audio_stream_type_t stream,
                                          int session)
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mAudioPolicyManager == NULL) {
         return NO_INIT;
     }
@@ -182,6 +188,9 @@
                                         audio_stream_type_t stream,
                                         int session)
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mAudioPolicyManager == NULL) {
         return NO_INIT;
     }
@@ -368,6 +377,9 @@
 
 uint32_t AudioPolicyService::getStrategyForStream(audio_stream_type_t stream)
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mAudioPolicyManager == NULL) {
         return 0;
     }
@@ -378,6 +390,9 @@
 
 audio_devices_t AudioPolicyService::getDevicesForStream(audio_stream_type_t stream)
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mAudioPolicyManager == NULL) {
         return (audio_devices_t)0;
     }
@@ -424,6 +439,9 @@
 
 bool AudioPolicyService::isStreamActive(audio_stream_type_t stream, uint32_t inPastMs) const
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mAudioPolicyManager == NULL) {
         return 0;
     }
@@ -433,6 +451,9 @@
 
 bool AudioPolicyService::isStreamActiveRemotely(audio_stream_type_t stream, uint32_t inPastMs) const
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mAudioPolicyManager == NULL) {
         return 0;
     }

services/audiopolicy/AudioPolicyInterfaceImplLegacy.cpp

diff --git a/services/audiopolicy/AudioPolicyInterfaceImplLegacy.cpp b/services/audiopolicy/AudioPolicyInterfaceImplLegacy.cpp
index ac41968..3700246 100644
--- a/services/audiopolicy/AudioPolicyInterfaceImplLegacy.cpp
+++ b/services/audiopolicy/AudioPolicyInterfaceImplLegacy.cpp
@@ -134,6 +134,9 @@
                                     audio_output_flags_t flags,
                                     const audio_offload_info_t *offloadInfo)
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mpAudioPolicy == NULL) {
         return 0;
     }
@@ -147,6 +150,9 @@
                                          audio_stream_type_t stream,
                                          int session)
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mpAudioPolicy == NULL) {
         return NO_INIT;
     }
@@ -172,6 +178,9 @@
                                         audio_stream_type_t stream,
                                         int session)
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mpAudioPolicy == NULL) {
         return NO_INIT;
     }
@@ -370,6 +379,9 @@
 
 uint32_t AudioPolicyService::getStrategyForStream(audio_stream_type_t stream)
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mpAudioPolicy == NULL) {
         return 0;
     }
@@ -380,6 +392,9 @@
 
 audio_devices_t AudioPolicyService::getDevicesForStream(audio_stream_type_t stream)
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mpAudioPolicy == NULL) {
         return (audio_devices_t)0;
     }
@@ -426,6 +441,9 @@
 
 bool AudioPolicyService::isStreamActive(audio_stream_type_t stream, uint32_t inPastMs) const
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mpAudioPolicy == NULL) {
         return 0;
     }
@@ -435,6 +453,9 @@
 
 bool AudioPolicyService::isStreamActiveRemotely(audio_stream_type_t stream, uint32_t inPastMs) const
 {
+    if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
+        return BAD_VALUE;
+    }
     if (mpAudioPolicy == NULL) {
         return 0;
     }