summaryrefslogtreecommitdiff
path: root/net/sctp/sm_statefuns.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/sctp/sm_statefuns.c')
-rw-r--r--net/sctp/sm_statefuns.c64
1 files changed, 52 insertions, 12 deletions
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 9b23c11cbb9e..3893b44448b3 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -74,7 +74,8 @@ static enum sctp_disposition sctp_sf_do_5_2_6_stale(
const struct sctp_association *asoc,
const union sctp_subtype type,
void *arg,
- struct sctp_cmd_seq *commands);
+ struct sctp_cmd_seq *commands,
+ struct sctp_errhdr *err);
static enum sctp_disposition sctp_sf_shut_8_4_5(
struct net *net,
const struct sctp_endpoint *ep,
@@ -415,6 +416,8 @@ enum sctp_disposition sctp_sf_do_5_1B_init(struct net *net,
/* Update socket peer label if first association. */
if (security_sctp_assoc_request(new_asoc, chunk->skb)) {
sctp_association_free(new_asoc);
+ if (err_chunk)
+ sctp_chunk_free(err_chunk);
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
}
@@ -705,11 +708,12 @@ enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net,
struct sctp_cmd_seq *commands)
{
struct sctp_ulpevent *ev, *ai_ev = NULL, *auth_ev = NULL;
+ struct sctp_chunk *err_chk_p = NULL;
struct sctp_association *new_asoc;
struct sctp_init_chunk *peer_init;
struct sctp_chunk *chunk = arg;
- struct sctp_chunk *err_chk_p;
struct sctp_chunk *repl;
+ enum sctp_cid cid;
struct sock *sk;
int error = 0;
@@ -783,6 +787,19 @@ enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net,
}
}
+ peer_init = (struct sctp_init_chunk *)(chunk->subh.cookie_hdr + 1);
+ cid = peer_init->chunk_hdr.type;
+ if (!sctp_sk(sk)->cookie_auth_enable &&
+ !sctp_verify_init(net, ep, asoc, cid, peer_init, chunk,
+ &err_chk_p)) {
+ sctp_association_free(new_asoc);
+ if (err_chk_p)
+ sctp_chunk_free(err_chk_p);
+ return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
+ }
+ if (err_chk_p)
+ sctp_chunk_free(err_chk_p);
+
if (security_sctp_assoc_request(new_asoc, chunk->head_skb ?: chunk->skb)) {
sctp_association_free(new_asoc);
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
@@ -796,7 +813,6 @@ enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net,
/* This is a brand-new association, so these are not yet side
* effects--it is safe to run them here.
*/
- peer_init = (struct sctp_init_chunk *)(chunk->subh.cookie_hdr + 1);
if (!sctp_process_init(new_asoc, chunk,
&chunk->subh.cookie_hdr->c.peer_addr,
peer_init, GFP_ATOMIC))
@@ -1606,6 +1622,8 @@ static enum sctp_disposition sctp_sf_do_unexpected_init(
/* Update socket peer label if first association. */
if (security_sctp_assoc_request(new_asoc, chunk->skb)) {
sctp_association_free(new_asoc);
+ if (err_chunk)
+ sctp_chunk_free(err_chunk);
return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
}
@@ -1671,6 +1689,7 @@ static enum sctp_disposition sctp_sf_do_unexpected_init(
* parameter type.
*/
sctp_addto_chunk(repl, len, unk_param);
+ sctp_chunk_free(err_chunk);
}
sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc));
@@ -2210,10 +2229,12 @@ enum sctp_disposition sctp_sf_do_5_2_4_dupcook(
void *arg,
struct sctp_cmd_seq *commands)
{
+ struct sctp_chunk *err_chk_p = NULL;
struct sctp_association *new_asoc;
+ struct sctp_init_chunk *peer_init;
struct sctp_chunk *chunk = arg;
enum sctp_disposition retval;
- struct sctp_chunk *err_chk_p;
+ enum sctp_cid cid;
int error = 0;
char action;
@@ -2282,6 +2303,21 @@ enum sctp_disposition sctp_sf_do_5_2_4_dupcook(
switch (action) {
case 'A': /* Association restart. */
case 'B': /* Collision case B. */
+ peer_init = (struct sctp_init_chunk *)
+ (chunk->subh.cookie_hdr + 1);
+ cid = peer_init->chunk_hdr.type;
+ if (!sctp_sk(ep->base.sk)->cookie_auth_enable &&
+ !sctp_verify_init(net, ep, asoc, cid, peer_init, chunk,
+ &err_chk_p)) {
+ sctp_association_free(new_asoc);
+ if (err_chk_p)
+ sctp_chunk_free(err_chk_p);
+ return sctp_sf_pdiscard(net, ep, asoc, type, arg,
+ commands);
+ }
+ if (err_chk_p)
+ sctp_chunk_free(err_chk_p);
+ fallthrough;
case 'D': /* Collision case D. */
/* Update socket peer label if first association. */
if (security_sctp_assoc_request((struct sctp_association *)asoc,
@@ -2494,9 +2530,15 @@ enum sctp_disposition sctp_sf_cookie_echoed_err(
* errors.
*/
sctp_walk_errors(err, chunk->chunk_hdr) {
- if (SCTP_ERROR_STALE_COOKIE == err->cause)
- return sctp_sf_do_5_2_6_stale(net, ep, asoc, type,
- arg, commands);
+ if (err->cause != SCTP_ERROR_STALE_COOKIE)
+ continue;
+ /* The staleness is only meaningful if the cause is long
+ * enough to hold it; a shorter one is malformed.
+ */
+ if (ntohs(err->length) < sizeof(*err) + sizeof(__be32))
+ break;
+ return sctp_sf_do_5_2_6_stale(net, ep, asoc, type,
+ arg, commands, err);
}
/* It is possible to have malformed error causes, and that
@@ -2538,13 +2580,13 @@ static enum sctp_disposition sctp_sf_do_5_2_6_stale(
const struct sctp_association *asoc,
const union sctp_subtype type,
void *arg,
- struct sctp_cmd_seq *commands)
+ struct sctp_cmd_seq *commands,
+ struct sctp_errhdr *err)
{
int attempts = asoc->init_err_counter + 1;
- struct sctp_chunk *chunk = arg, *reply;
struct sctp_cookie_preserve_param bht;
struct sctp_bind_addr *bp;
- struct sctp_errhdr *err;
+ struct sctp_chunk *reply;
u32 stale;
if (attempts > asoc->max_init_attempts) {
@@ -2555,8 +2597,6 @@ static enum sctp_disposition sctp_sf_do_5_2_6_stale(
return SCTP_DISPOSITION_DELETE_TCB;
}
- err = (struct sctp_errhdr *)(chunk->skb->data);
-
/* When calculating the time extension, an implementation
* SHOULD use the RTT information measured based on the
* previous COOKIE ECHO / ERROR exchange, and should add no
generated by cgit v1.2.3 (git 2.25.1) at 2026-07-24 20:38:55 +0000