Merge branch 'perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into perf/urgent

1 files changed, 8 insertions, 2 deletions

diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 676bc051252..2012a4ed272 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -120,9 +120,15 @@ fixup_bp_irq_link(unsigned long bp, unsigned long *stack,
 {
 #ifdef CONFIG_FRAME_POINTER
         struct stack_frame *frame = (struct stack_frame *)bp;
+        unsigned long next;
 
-        if (!in_irq_stack(stack, irq_stack, irq_stack_end))
-                return (unsigned long)frame->next_frame;
+        if (!in_irq_stack(stack, irq_stack, irq_stack_end)) {
+                if (!probe_kernel_address(&frame->next_frame, next))
+                        return next;
+                else
+                        WARN_ONCE(1, "Perf: bad frame pointer = %p in "
+                                  "callchain\n", &frame->next_frame);
+        }
 #endif
         return bp;
 }