etmem_scan: fix memleak in vm_idle_read

euleros inclusion
category: bugfix
bugzilla: NA

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

Struct page_idle_ctrl is alloced at beginning of vm_idle_read, but
it's not freed when vm_idle_read ends.

Fixes: bad4d883 ("etmem: add etmem-scan feature")
Signed-off-by: NKemeng Shi <shikemeng@huawei.com>
Reviewed-by: Jing Xiangfeng<jingxiangfeng@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

fs/proc/etmem_scan.c

@@ -753,6 +753,7 @@ static ssize_t vm_idle_read(struct file *file, char *buf,
 	ret = pic->bytes_copied;
 	*ppos = pic->next_hva;
 out_kvm:
+	kfree(pic);
 	return ret;
 
 }