e41e7ac3ee
but since the nfs cleanup, it hasn't done so in the case where `error' is EBADRPC. Callers of this macro expect it to initialise *mrq, and the `nfsmout' exit point expects a reply to be allocated if error == 0. When nfsm_reply() was called with error = EBADRPC, whatever junk was in *mrq (often a stale pointer to an old reply mbuf) would be assumed to be a valid reply and passed to pru_sosend(), causing a crash sooner or later. Fix this by allocating a reply even in the EBADRPC case like we used to do. This bug was specific to -current.
178 lines
5.3 KiB
C
178 lines
5.3 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfsm_subs.h 8.2 (Berkeley) 3/30/95
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* $FreeBSD$
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*/
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#ifndef _NFSSERVER_NFSM_SUBS_H_
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#define _NFSSERVER_NFSM_SUBS_H_
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#include <nfs/nfs_common.h>
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#define nfstov_mode(a) (fxdr_unsigned(u_int32_t, (a)) & ALLPERMS)
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/*
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* These macros do strange and peculiar things to mbuf chains for
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* the assistance of the nfs code. To attempt to use them for any
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* other purpose will be dangerous. (they make weird assumptions)
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*/
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/*
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* First define what the actual subs. return
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*/
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#define M_HASCL(m) ((m)->m_flags & M_EXT)
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#define NFSMSIZ(m) ((M_HASCL(m))?MCLBYTES: \
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(((m)->m_flags & M_PKTHDR)?MHLEN:MLEN))
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/*
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* Now for the macros that do the simple stuff and call the functions
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* for the hard stuff.
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* These macros use several vars. declared in nfsm_reqhead and these
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* vars. must not be used elsewhere unless you are careful not to corrupt
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* them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries
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* that may be used so long as the value is not expected to retained
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* after a macro.
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* I know, this is kind of dorkey, but it makes the actual op functions
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* fairly clean and deals with the mess caused by the xdr discriminating
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* unions.
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*/
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/* ************************************* */
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/* Dissection phase macros */
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int nfsm_srvstrsiz_xx(int *s, int m, struct mbuf **md, caddr_t *dpos);
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int nfsm_srvnamesiz_xx(int *s, struct mbuf **md, caddr_t *dpos);
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int nfsm_srvmtofh_xx(fhandle_t *f, struct nfsrv_descript *nfsd,
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struct mbuf **md, caddr_t *dpos);
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int nfsm_srvsattr_xx(struct vattr *a, struct mbuf **md, caddr_t *dpos);
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#define nfsm_srvstrsiz(s, m) \
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do { \
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int t1; \
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t1 = nfsm_srvstrsiz_xx(&(s), (m), &md, &dpos); \
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if (t1) { \
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error = t1; \
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nfsm_reply(0); \
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} \
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} while (0)
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#define nfsm_srvnamesiz(s) \
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do { \
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int t1; \
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t1 = nfsm_srvnamesiz_xx(&(s), &md, &dpos); \
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if (t1) { \
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error = t1; \
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nfsm_reply(0); \
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} \
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} while (0)
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#define nfsm_srvmtofh(f) \
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do { \
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int t1; \
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t1 = nfsm_srvmtofh_xx((f), nfsd, &md, &dpos); \
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if (t1) { \
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error = t1; \
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nfsm_reply(0); \
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} \
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} while (0)
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/* XXX why is this different? */
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#define nfsm_srvsattr(a) \
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do { \
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int t1; \
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t1 = nfsm_srvsattr_xx((a), &md, &dpos); \
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if (t1) { \
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error = t1; \
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m_freem(mrep); \
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mrep = NULL; \
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goto nfsmout; \
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} \
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} while (0)
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/* ************************************* */
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/* Prepare the reply */
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#define nfsm_reply(s) \
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do { \
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if (mrep != NULL) { \
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m_freem(mrep); \
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mrep = NULL; \
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} \
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mreq = nfs_rephead((s), nfsd, error, &mb, &bpos); \
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*mrq = mreq; \
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if (error == EBADRPC) { \
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error = 0; \
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goto nfsmout; \
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} \
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} while (0)
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#define nfsm_writereply(s) \
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do { \
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mreq = nfs_rephead((s), nfsd, error, &mb, &bpos); \
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} while(0)
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/* ************************************* */
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/* Reply phase macros - add additional reply info */
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void nfsm_srvfhtom_xx(fhandle_t *f, int v3, struct mbuf **mb,
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caddr_t *bpos);
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void nfsm_srvpostop_fh_xx(fhandle_t *f, struct mbuf **mb, caddr_t *bpos);
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void nfsm_clget_xx(u_int32_t **tl, struct mbuf *mb, struct mbuf **mp,
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char **bp, char **be, caddr_t bpos);
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#define nfsm_srvfhtom(f, v3) \
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nfsm_srvfhtom_xx((f), (v3), &mb, &bpos)
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#define nfsm_srvpostop_fh(f) \
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nfsm_srvpostop_fh_xx((f), &mb, &bpos)
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#define nfsm_srvwcc_data(br, b, ar, a) \
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nfsm_srvwcc(nfsd, (br), (b), (ar), (a), &mb, &bpos)
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#define nfsm_srvpostop_attr(r, a) \
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nfsm_srvpostopattr(nfsd, (r), (a), &mb, &bpos)
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#define nfsm_srvfillattr(a, f) \
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nfsm_srvfattr(nfsd, (a), (f))
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#define nfsm_clget \
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nfsm_clget_xx(&tl, mb, &mp, &bp, &be, bpos)
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#endif
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