sonivox: fix hang caused by bad meta-event
Bug: 69804002
Bug: 68953854
Bug: 68664359
Test: cts-tradefed run cts --class android.security.cts.StagefrightTest --method testStagefright_bug_68953854
Change-Id: I29e5ffd6f5be25180d7ed65806480257d79a884d
Merged-In: I19b3ca2d66866039b199d2049c6234df51797b3c
(cherry picked from commit ba9ea234666052f8415194966bcd242ea6fecf0e)
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? */
