1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index e19a91db9b35..96286df1bb81 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -787,6 +787,8 @@ static int ptrace_bts_status(struct task_struct *child,
                         cfg.flags |= PTRACE_BTS_O_SCHED;
         }
 
+        cfg.bts_size = sizeof(struct bts_struct);
+
         if (copy_to_user(ucfg, &cfg, sizeof(cfg)))
                 return -EFAULT;