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_64.c b/arch/sh/kernel/ptrace_64.c
index 4436eacddb15..c8f97649f354 100644
--- a/arch/sh/kernel/ptrace_64.c
+++ b/arch/sh/kernel/ptrace_64.c
@@ -403,6 +403,9 @@ 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);
                         tmp = get_fpu_long(child, index);
                 } else if (addr == offsetof(struct user, u_fpvalid)) {
@@ -442,6 +445,9 @@ 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);
                         ret = put_fpu_long(child, index, data);
                 }