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metag/ptrace: Preserve previous registers for short regset write
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.Martin@arm.com> Acked-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -303,7 +303,7 @@ static int metag_tls_set(struct task_struct *target,
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const void *kbuf, const void __user *ubuf)
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{
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int ret;
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void __user *tls;
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void __user *tls = target->thread.tls_ptr;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
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if (ret)
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