1 files changed, 7 insertions, 0 deletions

diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 329d9391c83d..06afa3103ace 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -761,6 +761,13 @@ syscall_trace(struct pt_regs *regs, int entryexit)
                                  ? 0x80 : 0));
 
         /*
+         * If the debuffer has set an invalid system call number,
+         * we prepare to skip the system call restart handling.
+         */
+        if (!entryexit && regs->gprs[2] >= NR_syscalls)
+                regs->trap = -1;
+
+        /*
          * this isn't the same as continuing with a signal, but it will do
          * for normal use.  strace only continues with a signal if the
          * stopping signal is not SIGTRAP.  -brl