Prevent optimization of huge functions.

diff --git a/ext/opcache/Optimizer/zend_ssa.c b/ext/opcache/Optimizer/zend_ssa.c
index b61a8dafa7ed017fee035df3d56658c3d7ba558b..d4cb20e3e3414d535143e2cd7e9d2453430b79e7 100644 (file)
--- a/ext/opcache/Optimizer/zend_ssa.c
+++ b/ext/opcache/Optimizer/zend_ssa.c
@@ -847,6 +847,11 @@ int zend_build_ssa(zend_arena **arena, const zend_script *script, const zend_op_
        ALLOCA_FLAG(dfg_use_heap)
        ALLOCA_FLAG(var_use_heap)
 
+       if ((blocks_count * (op_array->last_var + op_array->T)) > 4 * 1024 * 1024) {
+           /* Don't buld SSA for very big functions */
+               return FAILURE;
+       }
+
        ssa->rt_constants = (build_flags & ZEND_RT_CONSTANTS);
        ssa_blocks = zend_arena_calloc(arena, blocks_count, sizeof(zend_ssa_block));
        if (!ssa_blocks) {