1 files changed, 12 insertions, 0 deletions

diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c
index 48dc7d4d20bb..caab39dfa95d 100644
--- a/arch/parisc/kernel/unwind.c
+++ b/arch/parisc/kernel/unwind.c
@@ -14,6 +14,7 @@
 #include <linux/slab.h>
 #include <linux/kallsyms.h>
 #include <linux/sort.h>
+#include <linux/sched.h>
 
 #include <linux/uaccess.h>
 #include <asm/assembly.h>
@@ -279,6 +280,17 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
 
                         info->prev_sp = sp - 64;
                         info->prev_ip = 0;
+
+                        /* The stack is at the end inside the thread_union
+                         * struct. If we reach data, we have reached the
+                         * beginning of the stack and should stop unwinding. */
+                        if (info->prev_sp >= (unsigned long) task_thread_info(info->t) &&
+                            info->prev_sp < ((unsigned long) task_thread_info(info->t)
+                                                + THREAD_SZ_ALGN)) {
+                                info->prev_sp = 0;
+                                break;
+                        }
+
                         if (get_user(tmp, (unsigned long *)(info->prev_sp - RP_OFFSET))) 
                                 break;
                         info->prev_ip = tmp;