sh: Fix ptrace fpu state initialisation

Commit 0ea820cf introduced the PTRACE_GETFPREGS/SETFPREGS cmds,
but gdb-server still accesses the FPU state using the
PTRACE_PEEKUSR/POKEUSR commands. In this case, xstate was not
initialised.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Cc: stable@kernel.org
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c
index 90a15d29feeb..b53664ef53e8 100644
--- a/arch/sh/kernel/ptrace_32.c
+++ b/arch/sh/kernel/ptrace_32.c
@@ -392,6 +392,9 @@ long arch_ptrace(struct task_struct *child, long request,
                                         tmp = 0;
                         } else {
                                 unsigned long index;
+                                ret = init_fpu(child);
+                                if (ret)
+                                        break;
                                 index = addr - offsetof(struct user, fpu);
                                 tmp = ((unsigned long *)child->thread.xstate)
                                         [index >> 2];
@@ -423,6 +426,9 @@ long arch_ptrace(struct task_struct *child, long request,
                 else if (addr >= offsetof(struct user, fpu) &&
                          addr < offsetof(struct user, u_fpvalid)) {
                         unsigned long index;
+                        ret = init_fpu(child);
+                        if (ret)
+                                break;
                         index = addr - offsetof(struct user, fpu);
                         set_stopped_child_used_math(child);
                         ((unsigned long *)child->thread.xstate)