1 files changed, 3 insertions, 2 deletions

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index efd7a341614b..cd99b83f14c2 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -19,6 +19,7 @@
 #include <linux/user.h>
 #include <linux/security.h>
 #include <linux/init.h>
+#include <linux/signal.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -693,7 +694,7 @@ static int do_ptrace(int request, struct task_struct *child, long addr, long dat
                 case PTRACE_SYSCALL:
                 case PTRACE_CONT:
                         ret = -EIO;
-                        if ((unsigned long) data > _NSIG)
+                        if (!valid_signal(data))
                                 break;
                         if (request == PTRACE_SYSCALL)
                                 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
@@ -728,7 +729,7 @@ static int do_ptrace(int request, struct task_struct *child, long addr, long dat
                  */
                 case PTRACE_SINGLESTEP:
                         ret = -EIO;
-                        if ((unsigned long) data > _NSIG)
+                        if (!valid_signal(data))
                                 break;
                         child->ptrace |= PT_SINGLESTEP;
                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);