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obu: Validate obu_forbidden_bit in sequence header #2144

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May 2, 2024
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obu: Validate obu_forbidden_bit in sequence header #2144

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5 changes: 4 additions & 1 deletion src/obu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -413,7 +413,10 @@ avifBool avifSequenceHeaderParse(avifSequenceHeader * header, const avifROData *
avifBitsInit(&bits, obus.data, obus.size);

// obu_header()
avifBitsRead(&bits, 1); // obu_forbidden_bit
const uint8_t obu_forbidden_bit = avifBitsRead(&bits, 1);
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if (obu_forbidden_bit != 0) {
return AVIF_FALSE;
}
const uint32_t obu_type = avifBitsRead(&bits, 4);
const uint32_t obu_extension_flag = avifBitsRead(&bits, 1);
const uint32_t obu_has_size_field = avifBitsRead(&bits, 1);
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