static int vr_set(struct task_struct *target, const struct user_regset *regset,
		  unsigned int pos, unsigned int count,
		  const void *kbuf, const void __user *ubuf)
{
	int ret;

	flush_altivec_to_thread(target);

	BUILD_BUG_ON(offsetof(struct thread_vr_state, vscr) !=
		     offsetof(struct thread_vr_state, vr[32]));

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				 &target->thread.vr_state, 0,
				 33 * sizeof(vector128));
	if (!ret && count > 0) {
		/*
		 * We use only the first word of vrsave.
		 */
		union {
			elf_vrreg_t reg;
			u32 word;
		} vrsave;
		memset(&vrsave, 0, sizeof(vrsave));

		vrsave.word = target->thread.vrsave;

		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
					 33 * sizeof(vector128), -1);
		if (!ret)
			target->thread.vrsave = vrsave.word;
	}

	return ret;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.