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Fix a bug in sblock() that has existed since revision 1.1 from BSD:
  correctly return an error if M_NOWAIT is passed to sblock() and the
  operation might block.  This remarkably subtle macro bug appears to
  be responsible for quite a few undiagnosed socket buffer corruption
  and mbuf-related kernel panics.
This commit is contained in:
christos 2007-07-05 19:45:54 +00:00
parent ca741c4a3f
commit f3df14f9e8
1 changed files with 2 additions and 2 deletions
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4
sys/sys/socketvar.h
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@ -1,4 +1,4 @@
/* $NetBSD: socketvar.h,v 1.96 2007/06/24 18:00:16 dsl Exp $ */
/* $NetBSD: socketvar.h,v 1.97 2007/07/05 19:45:54 christos Exp $ */
/*-
* Copyright (c) 1982, 1986, 1990, 1993
@ -228,7 +228,7 @@ do { \
#define sblock(sb, wf) \
((sb)->sb_flags & SB_LOCK ? \
(((wf) == M_WAITOK) ? sb_lock(sb) : EWOULDBLOCK) : \
((sb)->sb_flags |= SB_LOCK), 0)
((sb)->sb_flags |= SB_LOCK, 0))
/* release lock on sockbuf sb */
#define sbunlock(sb) \