[automerger] sonivox: fix hang caused by bad meta-event am: ba9ea23466 am: 3983856ec1 am: 59644944e2 am: f3c51f7f1e am: d2901553df am: b0081b7c58 am: 88510ce7be am: ef8ae5940d am: 52fae8ba07

Change-Id: I2a0529ebc6d7cf717958fb543c7066e0ac68dd0a
diff --git a/arm-wt-22k/lib_src/eas_smf.c b/arm-wt-22k/lib_src/eas_smf.c
index 8b54b8e..3c284eb 100644
--- a/arm-wt-22k/lib_src/eas_smf.c
+++ b/arm-wt-22k/lib_src/eas_smf.c
@@ -29,6 +29,8 @@
  *----------------------------------------------------------------------------
 */
 
+#include "log/log.h"
+
 #include "eas_data.h"
 #include "eas_miditypes.h"
 #include "eas_parser.h"
@@ -833,6 +835,20 @@
     /* get the current file position so we can skip the event */
     if ((result = EAS_HWFilePos(pEASData->hwInstData, pSMFStream->fileHandle, &pos)) != EAS_SUCCESS)
         return result;
+
+    /* prevent a large unsigned length from being treated as a negative length */
+    if ((EAS_I32) len < 0) {
+        /* note that EAS_I32 is a long, which can be 64-bits on some computers */
+        ALOGE("b/68953854 SMF_ParseMetaEvent, negative len = %ld\n", (EAS_I32) len);
+        return EAS_ERROR_FILE_FORMAT;
+    }
+    /* prevent numeric overflow caused by a very large len, assume pos > 0 */
+    const EAS_I32 EAS_I32_MAX = 0x7FFFFFFF;
+    if ((EAS_I32) len > (EAS_I32_MAX - pos)) {
+        ALOGE("b/68953854 SMF_ParseMetaEvent, too large len = %ld\n", (EAS_I32) len);
+        return EAS_ERROR_FILE_FORMAT;
+    }
+
     pos += (EAS_I32) len;
 
     /* end of track? */