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In soreceive(), if any part of a received record has been freed,

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and an error occurs, make sure the socket doesn't retain a partial
copy by dropping the rest of the record.

This would otherwise trigger a panic("receive 1a") under DIAGNOSTIC.

Fixes PR#16990, suggested fix adapted.

Reviewed by Matt Thomas.
This commit is contained in:
he 2002-06-10 20:43:16 +00:00
parent c86d6704bc
commit a8c83879a2
1 changed files with 22 additions and 3 deletions
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25
sys/kern/uipc_socket.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uipc_socket.c,v 1.66 2002/05/07 08:06:35 enami Exp $ */
/* $NetBSD: uipc_socket.c,v 1.67 2002/06/10 20:43:16 he Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
@ -72,7 +72,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.66 2002/05/07 08:06:35 enami Exp $");
__KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.67 2002/06/10 20:43:16 he Exp $");
#include "opt_sock_counters.h"
#include "opt_sosend_loan.h"
@ -797,6 +797,7 @@ soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
int flags, len, error, s, offset, moff, type, orig_resid;
struct protosw *pr;
struct mbuf *nextrecord;
int mbuf_removed = 0;
pr = so->so_proto;
mp = mp0;
@ -918,6 +919,7 @@ soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
m = m->m_next;
} else {
sbfree(&so->so_rcv, m);
mbuf_removed = 1;
if (paddr) {
*paddr = m;
so->so_rcv.sb_mb = m->m_next;
@ -936,6 +938,7 @@ soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
m = m->m_next;
} else {
sbfree(&so->so_rcv, m);
mbuf_removed = 1;
if (controlp) {
if (pr->pr_domain->dom_externalize &&
mtod(m, struct cmsghdr *)->cmsg_type ==
@ -992,8 +995,24 @@ soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
splx(s);
error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio);
s = splsoftnet();
if (error)
if (error) {
/*
* If any part of the record has been removed
* (such as the MT_SONAME mbuf, which will
* happen when PR_ADDR, and thus also
* PR_ATOMIC, is set), then drop the entire
* record to maintain the atomicity of the
* receive operation.
*
* This avoids a later panic("receive 1a")
* when compiled with DIAGNOSTIC.
*/
if (m && mbuf_removed
&& (pr->pr_flags & PR_ATOMIC))
(void) sbdroprecord(&so->so_rcv);
goto release;
}
} else
uio->uio_resid -= len;
if (len == m->m_len - moff) {