K 10
svn:author
V 4
emax
K 8
svn:date
V 27
2009-04-21T19:14:13.525932Z
K 7
svn:log
V 764
Fix sbappendrecord_locked().

The main problem is that sbappendrecord_locked() relies on sbcompress()
to set sb_mbtail. This will not happen if sbappendrecord_locked() is
called with mbuf chain made of exactly one mbuf (i.e. m0->m_next == NULL).
In this case sbcompress() will be called with m == NULL and will do
nothing. I'm not entirely sure if m == NULL is a valid argument for
sbcompress(), and, it rather pointless to call it like that, but keep
calling it so it can do SBLASTMBUFCHK().

The problem is triggered by the SOCKBUF_DEBUG kernel option that
enables SBLASTRECORDCHK() and SBLASTMBUFCHK() checks.

PR:			kern/126742
Investigated by:	pluknet < pluknet -at- gmail -dot- com >
No response from:	freebsd-current@, freebsd-bluetooth@
MFC after:		3 days

END