[fix](mysql)fix mysql row buffer open_dynamic_mode make _pos pointer …

…out range of _buf #37936 (#38149)
apache · Jul 28, 2024 · aedec6e · aedec6e
1 parent 1079af3
commit aedec6e
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Showing 3 changed files with 42 additions and 1 deletion.
diff --git a/be/src/util/mysql_row_buffer.cpp b/be/src/util/mysql_row_buffer.cpp
@@ -41,6 +41,7 @@ namespace doris {
 static uint8_t NEXT_TWO_BYTE = 252;
 static uint8_t NEXT_THREE_BYTE = 253;
 static uint8_t NEXT_EIGHT_BYTE = 254;
+static size_t EXTRA_RESERVE_BYTE = 16;
 
 // the first byte:
 // <= 250: length
@@ -133,7 +134,7 @@ int MysqlRowBuffer<is_binary_format>::reserve(int64_t size) {
         return 0;
     }
 
-    int64_t alloc_size = std::max(need_size, _buf_size * 2);
+    int64_t alloc_size = std::max(need_size, _buf_size * 2) + EXTRA_RESERVE_BYTE;
     char* new_buf = new (std::nothrow) char[alloc_size];
 
     if (nullptr == new_buf) {