[PATCH 3.18 023/124] mips/ptrace: Preserve previous registers for short regset write

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dave Martin <dave.mar...@arm.com>

commit d614fd58a2834cfe4efa472c33c8f3ce2338b09b upstream.

Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill all the registers, the thread's old registers are preserved.

Signed-off-by: Dave Martin <dave.mar...@arm.com>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 arch/mips/kernel/ptrace.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -444,7 +444,8 @@ static int fpr_set(struct task_struct *t
                                          &target->thread.fpu,
                                          0, sizeof(elf_fpregset_t));
 
-       for (i = 0; i < NUM_FPU_REGS; i++) {
+       BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
+       for (i = 0; i < NUM_FPU_REGS && count >= sizeof(elf_fpreg_t); i++) {
                err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                         &fpr_val, i * sizeof(elf_fpreg_t),
                                         (i + 1) * sizeof(elf_fpreg_t));