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-rw-r--r--security/keys/encrypted-keys/encrypted.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c
index 2ab48eab29a1..d14f1a47a130 100644
--- a/security/keys/encrypted-keys/encrypted.c
+++ b/security/keys/encrypted-keys/encrypted.c
@@ -479,12 +479,9 @@ static int derived_key_encrypt(struct encrypted_key_payload *epayload,
struct skcipher_request *req;
unsigned int encrypted_datalen;
u8 iv[AES_BLOCK_SIZE];
- unsigned int padlen;
- char pad[16];
int ret;
encrypted_datalen = roundup(epayload->decrypted_datalen, blksize);
- padlen = encrypted_datalen - epayload->decrypted_datalen;
req = init_skcipher_req(derived_key, derived_keylen);
ret = PTR_ERR(req);
@@ -492,11 +489,10 @@ static int derived_key_encrypt(struct encrypted_key_payload *epayload,
goto out;
dump_decrypted_data(epayload);
- memset(pad, 0, sizeof pad);
sg_init_table(sg_in, 2);
sg_set_buf(&sg_in[0], epayload->decrypted_data,
epayload->decrypted_datalen);
- sg_set_buf(&sg_in[1], pad, padlen);
+ sg_set_page(&sg_in[1], ZERO_PAGE(0), AES_BLOCK_SIZE, 0);
sg_init_table(sg_out, 1);
sg_set_buf(sg_out, epayload->encrypted_data, encrypted_datalen);
@@ -583,9 +579,14 @@ static int derived_key_decrypt(struct encrypted_key_payload *epayload,
struct skcipher_request *req;
unsigned int encrypted_datalen;
u8 iv[AES_BLOCK_SIZE];
- char pad[16];
+ u8 *pad;
int ret;
+ /* Throwaway buffer to hold the unused zero padding at the end */
+ pad = kmalloc(AES_BLOCK_SIZE, GFP_KERNEL);
+ if (!pad)
+ return -ENOMEM;
+
encrypted_datalen = roundup(epayload->decrypted_datalen, blksize);
req = init_skcipher_req(derived_key, derived_keylen);
ret = PTR_ERR(req);
@@ -593,13 +594,12 @@ static int derived_key_decrypt(struct encrypted_key_payload *epayload,
goto out;
dump_encrypted_data(epayload, encrypted_datalen);
- memset(pad, 0, sizeof pad);
sg_init_table(sg_in, 1);
sg_init_table(sg_out, 2);
sg_set_buf(sg_in, epayload->encrypted_data, encrypted_datalen);
sg_set_buf(&sg_out[0], epayload->decrypted_data,
epayload->decrypted_datalen);
- sg_set_buf(&sg_out[1], pad, sizeof pad);
+ sg_set_buf(&sg_out[1], pad, AES_BLOCK_SIZE);
memcpy(iv, epayload->iv, sizeof(iv));
skcipher_request_set_crypt(req, sg_in, sg_out, encrypted_datalen, iv);
@@ -611,6 +611,7 @@ static int derived_key_decrypt(struct encrypted_key_payload *epayload,
goto out;
dump_decrypted_data(epayload);
out:
+ kfree(pad);
return ret;
}