[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
Change-Id: Icd393188467ddbd54bad568e7c602847fb709db5
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? */
