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Code Issues Releases Activity

sctp: improve handling of socket shutdown for reading

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If a socket is marked as cannot read anymore, drop chunks which
should be added to a control element in the receive queue.
This is consistent with dropping control elements instead of
adding them in the same situation.

Reported by:	syzbot+291f6581cecb77097b16@syzkaller.appspotmail.com
MFC after:	1 week
This commit is contained in:
Michael Tuexen 2023-08-24 15:52:55 +02:00
parent d10de21f2f
commit 847fa61fad
1 changed files with 11 additions and 7 deletions
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18
sys/netinet/sctp_indata.c
View File

@ -1290,14 +1290,17 @@ sctp_add_chk_to_control(struct sctp_queued_to_read *control,
* control and free up the chunk resources.
*/
uint32_t added = 0;
int i_locked = 0;
bool i_locked = false;
if (control->on_read_q && (hold_rlock == 0)) {
/*
* Its being pd-api'd so we must do some locks.
*/
SCTP_INP_READ_LOCK(stcb->sctp_ep);
i_locked = 1;
if (control->on_read_q) {
if (hold_rlock == 0) {
/* Its being pd-api'd so we must do some locks. */
SCTP_INP_READ_LOCK(stcb->sctp_ep);
i_locked = true;
}
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_CANT_READ) {
goto out;
}
}
if (control->data == NULL) {
control->data = chk->data;
@ -1346,6 +1349,7 @@ sctp_add_chk_to_control(struct sctp_queued_to_read *control,
control->end_added = 1;
control->last_frag_seen = 1;
}
out:
if (i_locked) {
SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
}