From: Eric Biggers <ebiggers@xxxxxxxxxx>
In the new arm64 CTS-CBC implementation, return an error code rather
than crashing on inputs shorter than AES_BLOCK_SIZE bytes. Also set
cra_blocksize to AES_BLOCK_SIZE (like is done in the cts template) to
indicate the minimum input size.
Fixes: dd597fb33ff0 ("crypto: arm64/aes-blk - add support for CTS-CBC mode")
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
arch/arm64/crypto/aes-glue.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/crypto/aes-glue.c b/arch/arm64/crypto/aes-glue.c
index 26d2b0263ba63..1e676625ef33f 100644
--- a/arch/arm64/crypto/aes-glue.c
+++ b/arch/arm64/crypto/aes-glue.c
@@ -243,8 +243,11 @@ static int cts_cbc_encrypt(struct skcipher_request *req)
skcipher_request_set_tfm(&rctx->subreq, tfm);
- if (req->cryptlen == AES_BLOCK_SIZE)
+ if (req->cryptlen <= AES_BLOCK_SIZE) {
+ if (req->cryptlen < AES_BLOCK_SIZE)
+ return -EINVAL;
cbc_blocks = 1;
+ }
if (cbc_blocks > 0) {
unsigned int blocks;
@@ -305,8 +308,11 @@ static int cts_cbc_decrypt(struct skcipher_request *req)
skcipher_request_set_tfm(&rctx->subreq, tfm);
- if (req->cryptlen == AES_BLOCK_SIZE)
+ if (req->cryptlen <= AES_BLOCK_SIZE) {
+ if (req->cryptlen < AES_BLOCK_SIZE)
+ return -EINVAL;
cbc_blocks = 1;
+ }
if (cbc_blocks > 0) {
unsigned int blocks;
@@ -486,14 +492,13 @@ static struct skcipher_alg aes_algs[] = { {
.cra_driver_name = "__cts-cbc-aes-" MODE,
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_INTERNAL,
- .cra_blocksize = 1,
+ .cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_module = THIS_MODULE,
},
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
- .chunksize = AES_BLOCK_SIZE,
.walksize = 2 * AES_BLOCK_SIZE,
.setkey = skcipher_aes_setkey,
.encrypt = cts_cbc_encrypt,
--
2.19.0
