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Bluetooth: ecdh_helper - reveal error codes 

ecdh_helper functions were hiding the error codes and chose to return
the return value of an relational operator, "==". Remove the unnecessary
query and reveal the error codes.

While updating the return values, code in a way that compilers will
warn in case of uninitialized err.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Tudor Ambarus 2017-09-28 17:14:52 +03:00 committed by Marcel Holtmann
parent 47eb2ac809
commit a297641610
3 changed files with 33 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
net/bluetooth/ecdh_helper.c
View File

@ -49,8 +49,8 @@ static inline void swap_digits(u64 *in, u64 *out, unsigned int ndigits)
out[i] = __swab64(in[ndigits - 1 - i]);
}
bool compute_ecdh_secret(struct crypto_kpp *tfm, const u8 public_key[64],
const u8 private_key[32], u8 secret[32])
int compute_ecdh_secret(struct crypto_kpp *tfm, const u8 public_key[64],
const u8 private_key[32], u8 secret[32])
{
struct kpp_request *req;
struct ecdh p;
@ -58,15 +58,17 @@ bool compute_ecdh_secret(struct crypto_kpp *tfm, const u8 public_key[64],
struct scatterlist src, dst;
u8 *tmp, *buf;
unsigned int buf_len;
int err = -ENOMEM;
int err;
tmp = kmalloc(64, GFP_KERNEL);
if (!tmp)
return false;
return -ENOMEM;
req = kpp_request_alloc(tfm, GFP_KERNEL);
if (!req)
if (!req) {
err = -ENOMEM;
goto free_tmp;
}
init_completion(&result.completion);
@ -80,8 +82,10 @@ bool compute_ecdh_secret(struct crypto_kpp *tfm, const u8 public_key[64],
p.curve_id = ECC_CURVE_NIST_P256;
buf_len = crypto_ecdh_key_len(&p);
buf = kmalloc(buf_len, GFP_KERNEL);
if (!buf)
if (!buf) {
err = -ENOMEM;
goto free_req;
}
crypto_ecdh_encode_key(buf, buf_len, &p);
@ -119,11 +123,11 @@ free_req:
kpp_request_free(req);
free_tmp:
kfree(tmp);
return (err == 0);
return err;
}
bool generate_ecdh_keys(struct crypto_kpp *tfm, u8 public_key[64],
u8 private_key[32])
int generate_ecdh_keys(struct crypto_kpp *tfm, u8 public_key[64],
u8 private_key[32])
{
struct kpp_request *req;
struct ecdh p;
@ -131,17 +135,19 @@ bool generate_ecdh_keys(struct crypto_kpp *tfm, u8 public_key[64],
struct scatterlist dst;
u8 *tmp, *buf;
unsigned int buf_len;
int err = -ENOMEM;
int err;
const unsigned short max_tries = 16;
unsigned short tries = 0;
tmp = kmalloc(64, GFP_KERNEL);
if (!tmp)
return false;
return -ENOMEM;
req = kpp_request_alloc(tfm, GFP_KERNEL);
if (!req)
if (!req) {
err = -ENOMEM;
goto free_tmp;
}
init_completion(&result.completion);
@ -202,5 +208,5 @@ free_req:
kpp_request_free(req);
free_tmp:
kfree(tmp);
return (err == 0);
return err;
}

8
net/bluetooth/ecdh_helper.h
View File

@ -23,7 +23,7 @@
#include <crypto/kpp.h>
#include <linux/types.h>
bool compute_ecdh_secret(struct crypto_kpp *tfm, const u8 pub_a[64],
const u8 priv_b[32], u8 secret[32]);
bool generate_ecdh_keys(struct crypto_kpp *tfm, u8 public_key[64],
u8 private_key[32]);
int compute_ecdh_secret(struct crypto_kpp *tfm, const u8 pub_a[64],
const u8 priv_b[32], u8 secret[32]);
int generate_ecdh_keys(struct crypto_kpp *tfm, u8 public_key[64],
u8 private_key[32]);

17
net/bluetooth/smp.c
View File

@ -577,9 +577,10 @@ int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16])
get_random_bytes(smp->local_sk, 32);
/* Generate local key pair for Secure Connections */
if (!generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk,
smp->local_sk))
return -EIO;
err = generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk,
smp->local_sk);
if (err)
return err;
/* This is unlikely, but we need to check that
* we didn't accidentially generate a debug key.
@ -1919,8 +1920,8 @@ static u8 sc_send_public_key(struct smp_chan *smp)
get_random_bytes(smp->local_sk, 32);
/* Generate local key pair for Secure Connections */
if (!generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk,
smp->local_sk))
if (generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk,
smp->local_sk))
return SMP_UNSPECIFIED;
/* This is unlikely, but we need to check that
@ -3532,11 +3533,13 @@ static inline void swap_digits(u64 *in, u64 *out, unsigned int ndigits)
static int __init test_debug_key(struct crypto_kpp *tfm_ecdh)
{
u8 pk[64], sk[32];
int err;
swap_digits((u64 *)debug_sk, (u64 *)sk, 4);
if (!generate_ecdh_keys(tfm_ecdh, pk, sk))
return -EINVAL;
err = generate_ecdh_keys(tfm_ecdh, pk, sk);
if (err)
return err;
if (crypto_memneq(sk, debug_sk, 32))
return -EINVAL;