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    Subject[PATCH 3.16 268/370] ARM: 8643/3: arm/ptrace: Preserve previous registers for short regset write
    3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

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

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

    commit 228dbbfb5d77f8e047b2a1d78da14b7158433027 upstream.

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

    Fixes: 5be6f62b0059 ("ARM: 6883/1: ptrace: Migrate to regsets framework")
    Signed-off-by: Dave Martin <Dave.Martin@arm.com>
    Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
    Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    ---
    arch/arm/kernel/ptrace.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/arm/kernel/ptrace.c
    +++ b/arch/arm/kernel/ptrace.c
    @@ -600,7 +600,7 @@ static int gpr_set(struct task_struct *t
    const void *kbuf, const void __user *ubuf)
    {
    int ret;
    - struct pt_regs newregs;
    + struct pt_regs newregs = *task_pt_regs(target);

    ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
    &newregs,
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