vm: fix potential invalid memory access in uc_vm_get_error_context()

If there's only native function calls on the call stack, the code
incorrectly accessed an invalid memory location.

Avoid that issue by stopping the search for non-native callframes
before the last frame.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index 9d97c0c..083c418 100644
--- a/vm.c
+++ b/vm.c
@@ -807,7 +807,7 @@ uc_vm_get_error_context(uc_vm *vm)
 	size_t offset, i;
 
 	/* skip to first non-native function call frame */
-	for (i = vm->callframes.count; i > 0; i--)
+	for (i = vm->callframes.count; i > 1; i--)
 		if (vm->callframes.entries[i - 1].closure)
 			break;