libstagefright: fix possible overflow in ID3.
Bug: 23129786
Change-Id: I2e6b7a6927aa4362ab49dd6824bbb1abf7b4e661
(cherry picked from commit 09da86913ca97d7a818a8917b6601527e5e18a24)
diff --git a/media/libstagefright/id3/ID3.cpp b/media/libstagefright/id3/ID3.cpp
index 3ef175b..894a9c9 100644
--- a/media/libstagefright/id3/ID3.cpp
+++ b/media/libstagefright/id3/ID3.cpp
@@ -327,7 +327,7 @@
size_t oldSize = mSize;
size_t offset = 0;
- while (offset + 10 <= mSize) {
+ while (mSize >= 10 && offset <= mSize - 10) {
if (!memcmp(&mData[offset], "\0\0\0\0", 4)) {
break;
}
@@ -339,7 +339,7 @@
return false;
}
- if (offset + dataSize + 10 > mSize) {
+ if (dataSize > mSize - 10 - offset) {
return false;
}
@@ -349,6 +349,9 @@
if (flags & 1) {
// Strip data length indicator
+ if (mSize < 14 || mSize - 14 < offset) {
+ return false;
+ }
memmove(&mData[offset + 10], &mData[offset + 14], mSize - offset - 14);
mSize -= 4;
dataSize -= 4;