thrieg/ft_malloc
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segfault in free #1

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opened 2025-12-13 05:46:29 +00:00 by thrieg · 0 comments
thrieg commented 2025-12-13 05:46:29 +00:00
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"else if (header->zone->type == E_SMALL)
{
header->occupied = false;
defrag_zone(header->zone);
}
else if (header->zone->type == E_TINY)
{
header->occupied = false;
defrag_zone(header->zone);
}
else
{
pthread_mutex_unlock(&g_mut);
return; // we didn't allocate this ptr
}"

defrag_zone can mummap the zone, so "else if (header->zone->type == E_TINY)" segfault (header not in user space anymore)

"else if (header->zone->type == E_SMALL) { header->occupied = false; defrag_zone(header->zone); } else if (header->zone->type == E_TINY) { header->occupied = false; defrag_zone(header->zone); } else { pthread_mutex_unlock(&g_mut); return; // we didn't allocate this ptr }" defrag_zone can mummap the zone, so "else if (header->zone->type == E_TINY)" segfault (header not in user space anymore)
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Reference: thrieg/ft_malloc#1
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