3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Maciej W. Rozycki <macro@xxxxxxxx> commit 006501e039eec411842bb3150c41358867d320c2 upstream. Complement commit d614fd58a283 ("mips/ptrace: Preserve previous registers for short regset write") and like with the PTRACE_GETREGSET ptrace(2) request also apply a BUILD_BUG_ON check for the size of the `elf_fpreg_t' type in the PTRACE_SETREGSET request handler. Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxx> Fixes: d614fd58a283 ("mips/ptrace: Preserve previous registers for short regset write") Cc: James Hogan <james.hogan@xxxxxxxx> Cc: Paul Burton <Paul.Burton@xxxxxxxx> Cc: Alex Smith <alex@xxxxxxxxxxxxxxxx> Cc: Dave Martin <Dave.Martin@xxxxxxx> Cc: linux-mips@xxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Patchwork: https://patchwork.linux-mips.org/patch/17929/ Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/mips/kernel/ptrace.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -428,6 +428,7 @@ static int fpr_get_msa(struct task_struc u64 fpr_val; int err; + BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t)); for (i = 0; i < NUM_FPU_REGS; i++) { fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0); err = user_regset_copyout(pos, count, kbuf, ubuf,