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sctp: use a consistent view of the send parameters

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Reported by:	syzbot+e26628a755f78bacff16@syzkaller.appspotmail.com
MFC after:	3 days
This commit is contained in:
Michael Tuexen 2022-05-28 19:35:58 +02:00
parent e2ceff3028
commit 2646cd0858
1 changed files with 4 additions and 1 deletions
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5
sys/netinet/sctp_output.c
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@ -12418,6 +12418,7 @@ sctp_lower_sosend(struct socket *so,
struct thread *p
)
{
struct sctp_nonpad_sndrcvinfo sndrcvninfo;
struct epoch_tracker et;
ssize_t sndlen = 0, max_len, local_add_more;
int error;
@ -12723,7 +12724,9 @@ sctp_lower_sosend(struct socket *so,
atomic_add_int(&asoc->refcnt, 1);
free_cnt_applied = true;
if (srcv == NULL) {
srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
/* Use a local copy to have a consistent view. */
sndrcvninfo = asoc->def_send;
srcv = (struct sctp_sndrcvinfo *)&sndrcvninfo;
sinfo_flags = srcv->sinfo_flags;
if (flags & MSG_EOR) {
sinfo_flags |= SCTP_EOR;