1 files changed, 5 insertions, 0 deletions

diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 76809ccd309c..d5718a060672 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -59,6 +59,11 @@ int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame)
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
         if (tsk->ret_stack &&
                         (frame->pc == (unsigned long)return_to_handler)) {
+                if (WARN_ON_ONCE(frame->graph == -1))
+                        return -EINVAL;
+                if (frame->graph < -1)
+                        frame->graph += FTRACE_NOTRACE_DEPTH;
+
                 /*
                  * This is a case where function graph tracer has
                  * modified a return address (LR) in a stack frame