random: Fix kabi change of get_random_bytes()

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6BB
CVE: NA

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

Commit 07280d2c3f33 ("random: make more consistent use of integer types")
change the type of parameter nbytes from int to size_t, which break kabi
compatibility.
Separately revert the relate modifications of get_random_bytes() to fix
kabi change.
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NGUO Zihua <guozihua@huawei.com>
Reviewed-by: NXiu Jianfeng <xiujianfeng@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

drivers/char/random.c

@@ -205,7 +205,7 @@ static void __cold process_random_ready_list(void)
  *
  * There are a few exported interfaces for use by other drivers:
  *
- *	void get_random_bytes(void *buf, size_t len)
+ *	void get_random_bytes(void *buf, int len)
  *	u32 get_random_u32()
  *	u64 get_random_u64()
  *	unsigned int get_random_int()
@@ -442,10 +442,10 @@ static void _get_random_bytes(void *buf, size_t len)
  * wait_for_random_bytes() should be called and return 0 at least once
  * at any point prior.
  */
-void get_random_bytes(void *buf, size_t len)
+void get_random_bytes(void *buf, int len)
 {
 	warn_unseeded_randomness();
-	_get_random_bytes(buf, len);
+	_get_random_bytes(buf, (size_t) len);
 }
 EXPORT_SYMBOL(get_random_bytes);
 

include/linux/random.h

@@ -28,7 +28,7 @@ static inline void add_latent_entropy(void)
 static inline void add_latent_entropy(void) { }
 #endif
 
-void get_random_bytes(void *buf, size_t len);
+void get_random_bytes(void *buf, int len);
 size_t __must_check get_random_bytes_arch(void *buf, size_t len);
 u32 get_random_u32(void);
 u64 get_random_u64(void);
@@ -75,7 +75,7 @@ int unregister_random_ready_notifier(struct notifier_block *nb);
 static inline int get_random_bytes_wait(void *buf, size_t nbytes)
 {
 	int ret = wait_for_random_bytes();
-	get_random_bytes(buf, nbytes);
+	get_random_bytes(buf, (int) nbytes);
 	return ret;
 }