SCTP: Fix to encode PROTOCOL VIOLATION error cause correctly

PROTOCOL VIOLATION error cause in ABORT is bad encode when make abort
chunk. When SCTP encode ABORT chunk with PROTOCOL VIOLATION error cause,
it just add the error messages to PROTOCOL VIOLATION error cause, the
rest four bytes(struct sctp_paramhdr) is just add to the chunk, not
change the length of error cause. This cause the ABORT chunk to be a bad
format. The chunk is like this:

ABORT chunk
  Chunk type: ABORT (6)
  Chunk flags: 0x00
  Chunk length: 72 (*1)
  Protocol violation cause
    Cause code: Protocol violation (0x000d)
    Cause length: 62 (*2)
    Cause information: 5468652063756D756C61746976652074736E2061636B2062...
    Cause padding: 0000
[Needless] 00030010
Chunk Length(*1) = 72 but Cause length(*2) only 62, not include the
extend 4 bytes.
((72 - sizeof(chunk_hdr)) = 68) != (62 +3) / 4 * 4

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

2 files changed, 54 insertions, 23 deletions

diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 93df833f34f..adc5e593472 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -110,7 +110,7 @@ static const struct sctp_paramhdr prsctp_param = {
  * abort chunk.
  */
 void  sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
-		      const void *payload, size_t paylen)
+		      size_t paylen)
 {
 	sctp_errhdr_t err;
 	__u16 len;
@@ -120,7 +120,6 @@ void  sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
 	len = sizeof(sctp_errhdr_t) + paylen;
 	err.length  = htons(len);
 	chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
-	sctp_addto_chunk(chunk, paylen, payload);
 }
 
 /* 3.3.2 Initiation (INIT) (1)
@@ -780,8 +779,8 @@ struct sctp_chunk *sctp_make_abort_no_data(
 
 	/* Put the tsn back into network byte order.  */
 	payload = htonl(tsn);
-	sctp_init_cause(retval, SCTP_ERROR_NO_DATA, (const void *)&payload,
-			sizeof(payload));
+	sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
+	sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
 
 	/* RFC 2960 6.4 Multi-homed SCTP Endpoints
 	 *
@@ -823,7 +822,8 @@ struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
 			goto err_copy;
 	}
 
-	sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, payload, paylen);
+	sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
+	sctp_addto_chunk(retval, paylen, payload);
 
 	if (paylen)
 		kfree(payload);
@@ -850,15 +850,17 @@ struct sctp_chunk *sctp_make_abort_violation(
 	struct sctp_paramhdr phdr;
 
 	retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
-					+ sizeof(sctp_chunkhdr_t));
+					+ sizeof(sctp_paramhdr_t));
 	if (!retval)
 		goto end;
 
-	sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, payload, paylen);
+	sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
+					+ sizeof(sctp_paramhdr_t));
 
 	phdr.type = htons(chunk->chunk_hdr->type);
 	phdr.length = chunk->chunk_hdr->length;
-	sctp_addto_chunk(retval, sizeof(sctp_paramhdr_t), &phdr);
+	sctp_addto_chunk(retval, paylen, payload);
+	sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
 
 end:
 	return retval;
@@ -955,7 +957,8 @@ struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
 	if (!retval)
 		goto nodata;
 
-	sctp_init_cause(retval, cause_code, payload, paylen);
+	sctp_init_cause(retval, cause_code, paylen);
+	sctp_addto_chunk(retval, paylen, payload);
 
 nodata:
 	return retval;
@@ -1143,6 +1146,25 @@ void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
 	return target;
 }
 
+/* Append bytes to the end of a parameter.  Will panic if chunk is not big
+ * enough.
+ */
+void *sctp_addto_param(struct sctp_chunk *chunk, int len, const void *data)
+{
+	void *target;
+	int chunklen = ntohs(chunk->chunk_hdr->length);
+
+	target = skb_put(chunk->skb, len);
+
+	memcpy(target, data, len);
+
+	/* Adjust the chunk length field.  */
+	chunk->chunk_hdr->length = htons(chunklen + len);
+	chunk->chunk_end = skb_tail_pointer(chunk->skb);
+
+	return target;
+}
+
 /* Append bytes from user space to the end of a chunk.  Will panic if
  * chunk is not big enough.
  * Returns a kernel err value.
@@ -1477,7 +1499,8 @@ no_hmac:
 			__be32 n = htonl(usecs);
 
 			sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
-					&n, sizeof(n));
+					sizeof(n));
+			sctp_addto_chunk(*errp, sizeof(n), &n);
 			*error = -SCTP_IERROR_STALE_COOKIE;
 		} else
 			*error = -SCTP_IERROR_NOMEM;
@@ -1567,7 +1590,8 @@ static int sctp_process_missing_param(const struct sctp_association *asoc,
 		report.num_missing = htonl(1);
 		report.type = paramtype;
 		sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
-				&report, sizeof(report));
+				sizeof(report));
+		sctp_addto_chunk(*errp, sizeof(report), &report);
 	}
 
 	/* Stop processing this chunk. */
@@ -1585,7 +1609,7 @@ static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
 		*errp = sctp_make_op_error_space(asoc, chunk, 0);
 
 	if (*errp)
-		sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, NULL, 0);
+		sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
 
 	/* Stop processing this chunk. */
 	return 0;
@@ -1606,9 +1630,10 @@ static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
 		*errp = sctp_make_op_error_space(asoc, chunk, payload_len);
 
 	if (*errp) {
-		sctp_init_cause(*errp, SCTP_ERROR_PROTO_VIOLATION, error,
-				sizeof(error));
-		sctp_addto_chunk(*errp, sizeof(sctp_paramhdr_t), param);
+		sctp_init_cause(*errp, SCTP_ERROR_PROTO_VIOLATION,
+				sizeof(error) + sizeof(sctp_paramhdr_t));
+		sctp_addto_chunk(*errp, sizeof(error), error);
+		sctp_addto_param(*errp, sizeof(sctp_paramhdr_t), param);
 	}
 
 	return 0;
@@ -1629,9 +1654,10 @@ static int sctp_process_hn_param(const struct sctp_association *asoc,
 	if (!*errp)
 		*errp = sctp_make_op_error_space(asoc, chunk, len);
 
-	if (*errp)
-		sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED,
-				param.v, len);
+	if (*errp) {
+		sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
+		sctp_addto_chunk(*errp, len, param.v);
+	}
 
 	/* Stop processing this chunk. */
 	return 0;
@@ -1683,10 +1709,13 @@ static int sctp_process_unk_param(const struct sctp_association *asoc,
 			*errp = sctp_make_op_error_space(asoc, chunk,
 					ntohs(chunk->chunk_hdr->length));
 
-		if (*errp)
+		if (*errp) {
 			sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
-					param.v,
 					WORD_ROUND(ntohs(param.p->length)));
+			sctp_addto_chunk(*errp,
+					WORD_ROUND(ntohs(param.p->length)),
+					param.v);
+		}
 
 		break;
 	case SCTP_PARAM_ACTION_SKIP:
@@ -1701,8 +1730,10 @@ static int sctp_process_unk_param(const struct sctp_association *asoc,
 
 		if (*errp) {
 			sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
-					param.v,
 					WORD_ROUND(ntohs(param.p->length)));
+			sctp_addto_chunk(*errp,
+					WORD_ROUND(ntohs(param.p->length)),
+					param.v);
 		} else {
 			/* If there is no memory for generating the ERROR
 			 * report as specified, an ABORT will be triggered
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 71cad56dd73..350d4765472 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -3362,7 +3362,7 @@ sctp_disposition_t sctp_sf_do_asconf_ack(const struct sctp_endpoint *ep,
 		abort = sctp_make_abort(asoc, asconf_ack,
 					sizeof(sctp_errhdr_t));
 		if (abort) {
-			sctp_init_cause(abort, SCTP_ERROR_ASCONF_ACK, NULL, 0);
+			sctp_init_cause(abort, SCTP_ERROR_ASCONF_ACK, 0);
 			sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
 					SCTP_CHUNK(abort));
 		}
@@ -3392,7 +3392,7 @@ sctp_disposition_t sctp_sf_do_asconf_ack(const struct sctp_endpoint *ep,
 		abort = sctp_make_abort(asoc, asconf_ack,
 					sizeof(sctp_errhdr_t));
 		if (abort) {
-			sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, NULL, 0);
+			sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0);
 			sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
 					SCTP_CHUNK(abort));
 		}