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sctp: allow sctp_init_cause to return errors 

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@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner 2018-04-29 12:56:31 -03:00 committed by David S. Miller
parent 065662d941
commit 6d3e8aa876
2 changed files with 10 additions and 4 deletions
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2
include/net/sctp/sm.h
View File

@ -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);

12
net/sctp/sm_make_chunk.c
View File

@ -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