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AV1: Fix parser looping on zero bytes #2661

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Merged
JeromeMartinez merged 1 commit into from
Sep 29, 2026
Merged

AV1: Fix parser looping on zero bytes #2661

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7 changes: 7 additions & 0 deletions Source/MediaInfo/Video/File_Av1.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -301,6 +301,13 @@ void File_Av1::Header_Parse()
int64u obu_size{};
if (IsAnnexB) {
Get_leb128 (obu_size, "obu_size");
if (obu_size == 0 && Element_Offset < Element_Size) {
// Prevents looping on zero bytes
// Real AV1 files should have OBU of at least one byte for the OBU header
// Exclude conditions where Get_leb128 runs out of buffer on valid files and returns 0
Reject();
return;
}
obu_size += Element_Offset;
DataMustAlwaysBeComplete = Element_Level > 3;
if (!DataMustAlwaysBeComplete)
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