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- Viewed 77k times72answered Jan 11, 2014 at 1:43
A double free in C, technically speaking, leads to undefined behavior. This means that the program can behave completely arbitrarily and all bets are off about what happens. That's certainly a bad thing to have happen! In practice, double-freeing a block of memory will corrupt the state of the memory manager, which might cause existing blocks of memory to get corrupted or for future allocations to fail in bizarre ways (for example, the same memory getting handed out on two different successive calls of malloc).
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