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drbd: receive_protocol(): We cannot change our own data-integrity-alg setting here

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Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Andreas Gruenbacher 2011-07-15 17:41:09 +02:00 committed by Philipp Reisner
parent d505d9bef2
commit accdbcc5f9
1 changed files with 14 additions and 9 deletions
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23
drivers/block/drbd/drbd_receiver.c
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@ -3002,7 +3002,7 @@ static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi)
int p_proto, p_discard_my_data, p_two_primaries, cf;
struct net_conf *nc, *old_net_conf, *new_net_conf = NULL;
char integrity_alg[SHARED_SECRET_MAX] = "";
struct crypto_hash *peer_integrity_tfm = NULL, *integrity_tfm = NULL;
struct crypto_hash *peer_integrity_tfm = NULL;
void *int_dig_in = NULL, *int_dig_vv = NULL;
p_proto = be32_to_cpu(p->protocol);
@ -3028,15 +3028,23 @@ static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi)
if (integrity_alg[0]) {
int hash_size;
/*
* We can only change the peer data integrity algorithm
* here. Changing our own data integrity algorithm
* requires that we send a P_PROTOCOL_UPDATE packet at
* the same time; otherwise, the peer has no way to
* tell between which packets the algorithm should
* change.
*/
peer_integrity_tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC);
integrity_tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC);
if (!(peer_integrity_tfm && integrity_tfm)) {
if (!peer_integrity_tfm) {
conn_err(tconn, "peer data-integrity-alg %s not supported\n",
integrity_alg);
goto disconnect;
}
hash_size = crypto_hash_digestsize(integrity_tfm);
hash_size = crypto_hash_digestsize(peer_integrity_tfm);
int_dig_in = kmalloc(hash_size, GFP_KERNEL);
int_dig_vv = kmalloc(hash_size, GFP_KERNEL);
if (!(int_dig_in && int_dig_vv)) {
@ -3064,9 +3072,6 @@ static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi)
strcpy(new_net_conf->integrity_alg, integrity_alg);
new_net_conf->integrity_alg_len = strlen(integrity_alg) + 1;
crypto_free_hash(tconn->integrity_tfm);
tconn->integrity_tfm = integrity_tfm;
rcu_assign_pointer(tconn->net_conf, new_net_conf);
mutex_unlock(&tconn->conf_update);
mutex_unlock(&tconn->data.mutex);
@ -3079,7 +3084,8 @@ static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi)
tconn->int_dig_vv = int_dig_vv;
if (strcmp(old_net_conf->integrity_alg, integrity_alg))
conn_info(tconn, "peer data-integrity-alg: %s\n", integrity_alg);
conn_info(tconn, "peer data-integrity-alg: %s\n",
integrity_alg[0] ? integrity_alg : "(none)");
synchronize_rcu();
kfree(old_net_conf);
@ -3135,7 +3141,6 @@ static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi)
rcu_read_unlock();
disconnect:
crypto_free_hash(peer_integrity_tfm);
crypto_free_hash(integrity_tfm);
kfree(int_dig_in);
kfree(int_dig_vv);
conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD);