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-rw-r--r--media/libstagefright/OggExtractor.cpp13
1 files changed, 9 insertions, 4 deletions
diff --git a/media/libstagefright/OggExtractor.cpp b/media/libstagefright/OggExtractor.cpp
index 5e79e78..073c53f 100644
--- a/media/libstagefright/OggExtractor.cpp
+++ b/media/libstagefright/OggExtractor.cpp
@@ -923,11 +923,12 @@ static void extractAlbumArt(
}
typeLen = U32_AT(&flac[4]);
- if (typeLen + 1 > sizeof(type)) {
+ if (typeLen > sizeof(type) - 1) {
goto exit;
}
- if (flacSize < 8 + typeLen) {
+ // we've already checked above that flacSize >= 8
+ if (flacSize - 8 < typeLen) {
goto exit;
}
@@ -943,13 +944,17 @@ static void extractAlbumArt(
descLen = U32_AT(&flac[8 + typeLen]);
- if (flacSize < 32 + typeLen + descLen) {
+ if (flacSize < 32 ||
+ flacSize - 32 < typeLen ||
+ flacSize - 32 - typeLen < descLen) {
goto exit;
}
dataLen = U32_AT(&flac[8 + typeLen + 4 + descLen + 16]);
- if (flacSize < 32 + typeLen + descLen + dataLen) {
+
+ // we've already checked above that (flacSize - 32 - typeLen - descLen) >= 0
+ if (flacSize - 32 - typeLen - descLen < dataLen) {
goto exit;
}