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| author | Michal Schmidt <mschmidt@redhat.com> | 2007-09-29 02:52:46 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-10-10 21:50:15 +0400 |
| commit | d69fedce483a75ea59fedda08aba9123adc92e80 (patch) | |
| tree | 86170c81ec30874d84684bd61579b30ed0e26ba4 | |
| parent | 3486d1c0e03c6df55ca741f74e4a561a3022698b (diff) | |
| download | linux-d69fedce483a75ea59fedda08aba9123adc92e80.tar.xz | |
Fix ppp_mppe kernel stack usage.
commit 45dfd5b5dd20f17fe23dafc5cfe921474d27f849 from upstream
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/net/ppp_mppe.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/drivers/net/ppp_mppe.c b/drivers/net/ppp_mppe.c index d5bdd2574659..39e0e12f0cff 100644 --- a/drivers/net/ppp_mppe.c +++ b/drivers/net/ppp_mppe.c @@ -136,7 +136,7 @@ struct ppp_mppe_state { * Key Derivation, from RFC 3078, RFC 3079. * Equivalent to Get_Key() for MS-CHAP as described in RFC 3079. */ -static void get_new_key_from_sha(struct ppp_mppe_state * state, unsigned char *InterimKey) +static void get_new_key_from_sha(struct ppp_mppe_state * state) { struct hash_desc desc; struct scatterlist sg[4]; @@ -153,8 +153,6 @@ static void get_new_key_from_sha(struct ppp_mppe_state * state, unsigned char *I desc.flags = 0; crypto_hash_digest(&desc, sg, nbytes, state->sha1_digest); - - memcpy(InterimKey, state->sha1_digest, state->keylen); } /* @@ -163,21 +161,21 @@ static void get_new_key_from_sha(struct ppp_mppe_state * state, unsigned char *I */ static void mppe_rekey(struct ppp_mppe_state * state, int initial_key) { - unsigned char InterimKey[MPPE_MAX_KEY_LEN]; struct scatterlist sg_in[1], sg_out[1]; struct blkcipher_desc desc = { .tfm = state->arc4 }; - get_new_key_from_sha(state, InterimKey); + get_new_key_from_sha(state); if (!initial_key) { - crypto_blkcipher_setkey(state->arc4, InterimKey, state->keylen); - setup_sg(sg_in, InterimKey, state->keylen); + crypto_blkcipher_setkey(state->arc4, state->sha1_digest, + state->keylen); + setup_sg(sg_in, state->sha1_digest, state->keylen); setup_sg(sg_out, state->session_key, state->keylen); if (crypto_blkcipher_encrypt(&desc, sg_out, sg_in, state->keylen) != 0) { printk(KERN_WARNING "mppe_rekey: cipher_encrypt failed\n"); } } else { - memcpy(state->session_key, InterimKey, state->keylen); + memcpy(state->session_key, state->sha1_digest, state->keylen); } if (state->keylen == 8) { /* See RFC 3078 */ |