And do so if the skb doesn't have enough space for the payload.
This is a preparation for the next patch.
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
---
include/net/sctp/sm.h | 2 +-
net/sctp/sm_make_chunk.c | 12 +++++++++---
2 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index f4b657478a304050851f33d92c71162a4a4a2e50..5ef1bad81ef54906b375dbfd0e4fd897d078abce 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -215,7 +215,7 @@ struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
struct sctp_chunk *sctp_make_shutdown_complete(
const struct sctp_association *asoc,
const struct sctp_chunk *chunk);
-void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause, size_t paylen);
+int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause, size_t paylen);
struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
const struct sctp_chunk *chunk,
const size_t hint);
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index db93eabd6ef500ab20be6e091ee06bd3b60923c9..e518eb64ccf3578f7892da050c160a56cf3cc833 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -158,8 +158,8 @@ static const struct sctp_paramhdr prsctp_param = {
* provided chunk, as most cause codes will be embedded inside an
* abort chunk.
*/
-void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
- size_t paylen)
+int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
+ size_t paylen)
{
struct sctp_errhdr err;
__u16 len;
@@ -167,8 +167,14 @@ void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
/* Cause code constants are now defined in network order. */
err.cause = cause_code;
len = sizeof(err) + paylen;
- err.length = htons(len);
+ err.length = htons(len);
+
+ if (skb_tailroom(chunk->skb) < len)
+ return -ENOSPC;
+
chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err);
+
+ return 0;
}
/* A helper to initialize an op error inside a
--
2.14.3
--
To unsubscribe from this list: send the line "unsubscribe linux-sctp" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
