lib: only consider context of calling function for callbacks

Do not walk up the entire call stack but specifically use the context of the
callframe calling the C function.

Fixes: 3e893e6 ("lib: pass-through "this" context to library function callbacks")
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 2 insertions, 7 deletions

diff --git a/lib.c b/lib.c
index c9ebcb2..e95edd8 100644
--- a/lib.c
+++ b/lib.c
@@ -266,14 +266,9 @@ static void
 uc_vm_ctx_push(uc_vm *vm)
 {
 	uc_value_t *ctx = NULL;
-	size_t i;
 
-	for (i = vm->callframes.count; i > 0; i--) {
-		if (vm->callframes.entries[i - 1].ctx) {
-			ctx = vm->callframes.entries[i - 1].ctx;
-			break;
-		}
-	}
+	if (vm->callframes.count >= 2)
+		ctx = vm->callframes.entries[vm->callframes.count - 2].ctx;
 
 	uc_vm_stack_push(vm, ucv_get(ctx));
 }