Fix stack overflow of new coctx_make

zhongcy · Dec 9, 2019 · c79e3e8 · c79e3e8
1 parent 6c896ce
commit c79e3e8
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/coctx.cpp b/coctx.cpp
@@ -109,7 +109,7 @@ int coctx_make(coctx_t* ctx, coctx_pfn_t pfn, const void* s, const void* s1) {
 #elif defined(__x86_64__)
 int coctx_make(coctx_t* ctx, coctx_pfn_t pfn, const void* s, const void* s1) {
   char* sp = ctx->ss_sp + ctx->ss_size;
-  sp = (char*)((unsigned long)sp & -16LL);
+  sp = (char*)((unsigned long)sp & -16LL) - sizeof(void*);
 
   memset(ctx->regs, 0, sizeof(ctx->regs));
   void** ret_addr = (void**)(sp);