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Clear the buffer byte between ATB and FTB #5348

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Sep 15, 2021
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Clear the buffer byte between ATB and FTB #5348

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6 changes: 4 additions & 2 deletions py/gc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -150,8 +150,10 @@ void gc_init(void *start, void *end) {
assert(MP_STATE_MEM(gc_pool_start) >= MP_STATE_MEM(gc_finaliser_table_start) + gc_finaliser_table_byte_len);
#endif

// clear ATBs
memset(MP_STATE_MEM(gc_alloc_table_start), 0, MP_STATE_MEM(gc_alloc_table_byte_len));
// Clear ATBs plus one more byte. The extra byte might be read when we read the final ATB and
// then try to count its tail. Clearing the byte ensures it is 0 and ends the chain. Without an
// FTB, it'll just clear the pool byte early.
memset(MP_STATE_MEM(gc_alloc_table_start), 0, MP_STATE_MEM(gc_alloc_table_byte_len) + 1);

#if MICROPY_ENABLE_FINALISER
// clear FTBs
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