x86/unwind: Detect bad stack return address

[karo-tx-linux.git] / arch / x86 / kernel / unwind_frame.c

diff --git a/arch/x86/kernel/unwind_frame.c b/arch/x86/kernel/unwind_frame.c
index 9be9a8f8c5dfeba9406b4a04cc50fc0f36fbae19..5639db619c03b53e545a61141804a1d975f2e3cf 100644 (file)
--- a/arch/x86/kernel/unwind_frame.c
+++ b/arch/x86/kernel/unwind_frame.c
@@ -20,7 +20,15 @@ unsigned long unwind_get_return_address(struct unwind_state *state)
        addr = ftrace_graph_ret_addr(state->task, &state->graph_idx, *addr_p,
                                     addr_p);
 
-       return __kernel_text_address(addr) ? addr : 0;
+       if (!__kernel_text_address(addr)) {
+               printk_deferred_once(KERN_WARNING
+                       "WARNING: unrecognized kernel stack return address %p at %p in %s:%d\n",
+                       (void *)addr, addr_p, state->task->comm,
+                       state->task->pid);
+               return 0;
+       }
+
+       return addr;
 }
 EXPORT_SYMBOL_GPL(unwind_get_return_address);