unix/stream: fix instant panic w/o INVARIANTS

A stupid microoptimization I made leaving empty STAILQ inconsistent
is a brainfart that is related to much earlier version of this code,
where it was safe to do so.

Pointy hat to:	glebius
Fixes:		69f61cee2e

This commit is contained in:

Gleb Smirnoff

2025-11-14 08:01:47 -08:00

parent b0c1ead2b9

commit 82d8a5029a

1 changed files with 2 additions and 3 deletions

									
										sys/kern/uipc_usrreq.c
									
		+2
		-3
	
												View File
												
				@@ -1492,11 +1492,10 @@ uipc_soreceive_stream_or_seqpacket(struct socket *so, struct sockaddr **psa,

					}

					if (!peek) {

						STAILQ_FIRST(&sb->uxst_mbq) = next;

				#ifdef INVARIANTS

						if (next == NULL)

							STAILQ_INIT(&sb->uxst_mbq);

				#endif

						else

							STAILQ_FIRST(&sb->uxst_mbq) = next;

						MPASS(sb->sb_acc >= datalen);

						sb->sb_acc -= datalen;

						sb->sb_ccc -= datalen;