Commit 30606486 authored by marko@hundin.mysql.fi's avatar marko@hundin.mysql.fi

InnoDB bug fix: mem_realloc() didn't preserve the block contents

parent d2724e66
......@@ -575,9 +575,21 @@ mem_realloc(
char* file_name,/* in: file name where called */
ulint line) /* in: line where called */
{
mem_free(buf);
return(mem_alloc_func(n, file_name, line));
mem_heap_t* heap = (mem_heap_t*)((byte*)buf
- MEM_BLOCK_HEADER_SIZE - MEM_FIELD_HEADER_SIZE);
ulint size;
ut_a(heap->magic_n == MEM_BLOCK_MAGIC_N);
size = mem_block_get_len(heap);
ut_a(size > MEM_BLOCK_HEADER_SIZE + MEM_FIELD_HEADER_SIZE);
size -= MEM_BLOCK_HEADER_SIZE + MEM_FIELD_HEADER_SIZE;
if (n > size) {
void* newbuf = memcpy(mem_alloc_func(n, file_name, line),
buf, size);
mem_free(buf);
buf = newbuf;
}
return(buf);
}
/**************************************************************************
......
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