better validation lengths of strings in ID3 tags am: d23c01546c am: e3fad118bb am: 019973a8d4 am: d936eadf31 am: 94875f51ca am: 49c95c0e2a
am: 6dd5f688e5
Change-Id: I9ea5038a76caa7b0642426618b08f4f36ca6bc91
diff --git a/media/libstagefright/id3/ID3.cpp b/media/libstagefright/id3/ID3.cpp
index 4410579..6e14197 100644
--- a/media/libstagefright/id3/ID3.cpp
+++ b/media/libstagefright/id3/ID3.cpp
@@ -77,7 +77,10 @@
mFirstFrameOffset(0),
mVersion(ID3_UNKNOWN),
mRawSize(0) {
- sp<MemorySource> source = new MemorySource(data, size);
+ sp<MemorySource> source = new (std::nothrow) MemorySource(data, size);
+
+ if (source == NULL)
+ return;
mIsValid = parseV2(source, 0);
@@ -542,6 +545,10 @@
n -= skipped;
}
+ if (n <= 0) {
+ return;
+ }
+
if (encoding == 0x00) {
// supposedly ISO 8859-1
id->setTo((const char*)frameData + 1, n);
@@ -555,11 +562,16 @@
const char16_t *framedata = (const char16_t *) (frameData + 1);
char16_t *framedatacopy = NULL;
#if BYTE_ORDER == LITTLE_ENDIAN
- framedatacopy = new char16_t[len];
- for (int i = 0; i < len; i++) {
- framedatacopy[i] = bswap_16(framedata[i]);
+ if (len > 0) {
+ framedatacopy = new (std::nothrow) char16_t[len];
+ if (framedatacopy == NULL) {
+ return;
+ }
+ for (int i = 0; i < len; i++) {
+ framedatacopy[i] = bswap_16(framedata[i]);
+ }
+ framedata = framedatacopy;
}
- framedata = framedatacopy;
#endif
id->setTo(framedata, len);
if (framedatacopy != NULL) {
@@ -572,15 +584,26 @@
const char16_t *framedata = (const char16_t *) (frameData + 1);
char16_t *framedatacopy = NULL;
if (*framedata == 0xfffe) {
- // endianness marker doesn't match host endianness, convert
- framedatacopy = new char16_t[len];
+ // endianness marker != host endianness, convert & skip
+ if (len <= 1) {
+ return; // nothing after the marker
+ }
+ framedatacopy = new (std::nothrow) char16_t[len];
+ if (framedatacopy == NULL) {
+ return;
+ }
for (int i = 0; i < len; i++) {
framedatacopy[i] = bswap_16(framedata[i]);
}
framedata = framedatacopy;
- }
- // If the string starts with an endianness marker, skip it
- if (*framedata == 0xfeff) {
+ // and skip over the marker
+ framedata++;
+ len--;
+ } else if (*framedata == 0xfeff) {
+ // endianness marker == host endianness, skip it
+ if (len <= 1) {
+ return; // nothing after the marker
+ }
framedata++;
len--;
}
@@ -595,12 +618,16 @@
}
if (eightBit) {
// collapse to 8 bit, then let the media scanner client figure out the real encoding
- char *frame8 = new char[len];
- for (int i = 0; i < len; i++) {
- frame8[i] = framedata[i];
+ char *frame8 = new (std::nothrow) char[len];
+ if (frame8 != NULL) {
+ for (int i = 0; i < len; i++) {
+ frame8[i] = framedata[i];
+ }
+ id->setTo(frame8, len);
+ delete [] frame8;
+ } else {
+ id->setTo(framedata, len);
}
- id->setTo(frame8, len);
- delete [] frame8;
} else {
id->setTo(framedata, len);
}