git-fast-import possible memory corruption problem
Internal "allocate in bulk, we will never free this memory anyway" allocator used in fast-import had a logic to round up the size of the requested memory block in a wrong place (it computed if the available space is enough to fit the request first, and then carved a chunk of memory by size rounded up to the alignment, which could go beyond the actually available space). Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -554,6 +554,10 @@ static void *pool_alloc(size_t len)
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struct mem_pool *p;
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void *r;
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/* round up to a 'uintmax_t' alignment */
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if (len & (sizeof(uintmax_t) - 1))
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len += sizeof(uintmax_t) - (len & (sizeof(uintmax_t) - 1));
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for (p = mem_pool; p; p = p->next_pool)
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if ((p->end - p->next_free >= len))
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break;
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@ -572,9 +576,6 @@ static void *pool_alloc(size_t len)
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}
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r = p->next_free;
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/* round out to a 'uintmax_t' alignment */
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if (len & (sizeof(uintmax_t) - 1))
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len += sizeof(uintmax_t) - (len & (sizeof(uintmax_t) - 1));
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p->next_free += len;
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return r;
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}
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