crypto: bcm - Verify GCM/CCM key length in setkey

The setkey function for GCM/CCM algorithms didn't verify the key
length before copying the key and subtracting the salt length.

This patch delays the copying of the key til after the verification
has been done.  It also adds checks on the key length to ensure
that it's at least as long as the salt.

Fixes: 9d12ba86 ("crypto: brcm - Add Broadcom SPU driver")
Cc: <stable@vger.kernel.org>
Reported-by: kiyin(尹亮) <kiyin@tencent.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/bcm/cipher.c

@@ -2867,7 +2867,6 @@ static int aead_gcm_ccm_setkey(struct crypto_aead *cipher,
 
 	ctx->enckeylen = keylen;
 	ctx->authkeylen = 0;
-	memcpy(ctx->enckey, key, ctx->enckeylen);
 
 	switch (ctx->enckeylen) {
 	case AES_KEYSIZE_128:
@@ -2883,6 +2882,8 @@ static int aead_gcm_ccm_setkey(struct crypto_aead *cipher,
 		goto badkey;
 	}
 
+	memcpy(ctx->enckey, key, ctx->enckeylen);
+
 	flow_log("  enckeylen:%u authkeylen:%u\n", ctx->enckeylen,
 		 ctx->authkeylen);
 	flow_dump("  enc: ", ctx->enckey, ctx->enckeylen);
@@ -2937,6 +2938,10 @@ static int aead_gcm_esp_setkey(struct crypto_aead *cipher,
 	struct iproc_ctx_s *ctx = crypto_aead_ctx(cipher);
 
 	flow_log("%s\n", __func__);
+
+	if (keylen < GCM_ESP_SALT_SIZE)
+		return -EINVAL;
+
 	ctx->salt_len = GCM_ESP_SALT_SIZE;
 	ctx->salt_offset = GCM_ESP_SALT_OFFSET;
 	memcpy(ctx->salt, key + keylen - GCM_ESP_SALT_SIZE, GCM_ESP_SALT_SIZE);
@@ -2965,6 +2970,10 @@ static int rfc4543_gcm_esp_setkey(struct crypto_aead *cipher,
 	struct iproc_ctx_s *ctx = crypto_aead_ctx(cipher);
 
 	flow_log("%s\n", __func__);
+
+	if (keylen < GCM_ESP_SALT_SIZE)
+		return -EINVAL;
+
 	ctx->salt_len = GCM_ESP_SALT_SIZE;
 	ctx->salt_offset = GCM_ESP_SALT_OFFSET;
 	memcpy(ctx->salt, key + keylen - GCM_ESP_SALT_SIZE, GCM_ESP_SALT_SIZE);
@@ -2994,6 +3003,10 @@ static int aead_ccm_esp_setkey(struct crypto_aead *cipher,
 	struct iproc_ctx_s *ctx = crypto_aead_ctx(cipher);
 
 	flow_log("%s\n", __func__);
+
+	if (keylen < CCM_ESP_SALT_SIZE)
+		return -EINVAL;
+
 	ctx->salt_len = CCM_ESP_SALT_SIZE;
 	ctx->salt_offset = CCM_ESP_SALT_OFFSET;
 	memcpy(ctx->salt, key + keylen - CCM_ESP_SALT_SIZE, CCM_ESP_SALT_SIZE);