Author: luigi
Date: Wed Jun 10 10:47:31 2009
New Revision: 193896
URL: http://svn.freebsd.org/changeset/base/193896
Log:
in ip_dn_ctl(), do not allocate a large structure on the stack,
and use malloc() instead if/when it is necessary.
The problem is less relevant in previous versions because
the variable involved (tmp_pipe) is much smaller there.
Still worth fixing though.
Submitted by: Marta Carbone (GSOC)
MFC after: 3 days
Modified:
head/sys/netinet/ipfw/ip_dummynet.c
Modified: head/sys/netinet/ipfw/ip_dummynet.c
==============================================================================
--- head/sys/netinet/ipfw/ip_dummynet.c Wed Jun 10 10:39:41 2009
(r193895)
+++ head/sys/netinet/ipfw/ip_dummynet.c Wed Jun 10 10:47:31 2009
(r193896)
@@ -2165,9 +2165,8 @@ dummynet_get(struct sockopt *sopt)
static int
ip_dn_ctl(struct sockopt *sopt)
{
- int error = 0 ;
- struct dn_pipe *p;
- struct dn_pipe_max tmp_pipe; /* pipe + large buffer */
+ int error;
+ struct dn_pipe *p = NULL;
error = priv_check(sopt->sopt_td, PRIV_NETINET_DUMMYNET);
if (error)
@@ -2188,7 +2187,8 @@ ip_dn_ctl(struct sockopt *sopt)
switch (sopt->sopt_name) {
default :
printf("dummynet: -- unknown option %d", sopt->sopt_name);
- return EINVAL ;
+ error = EINVAL ;
+ break;
case IP_DUMMYNET_GET :
error = dummynet_get(sopt);
@@ -2199,25 +2199,27 @@ ip_dn_ctl(struct sockopt *sopt)
break ;
case IP_DUMMYNET_CONFIGURE :
- p = (struct dn_pipe *)&tmp_pipe ;
- error = sooptcopyin(sopt, p, sizeof(tmp_pipe), sizeof *p);
+ p = malloc(sizeof(struct dn_pipe_max), M_TEMP, M_WAITOK);
+ error = sooptcopyin(sopt, p, sizeof(struct dn_pipe_max), sizeof *p);
if (error)
break ;
if (p->samples_no > 0)
- p->samples = &tmp_pipe.samples[0];
+ p->samples = &(((struct dn_pipe_max *)p)->samples[0]);
error = config_pipe(p);
break ;
case IP_DUMMYNET_DEL : /* remove a pipe or queue */
- p = (struct dn_pipe *)&tmp_pipe ;
- error = sooptcopyin(sopt, p, sizeof *p, sizeof *p);
+ p = malloc(sizeof(struct dn_pipe), M_TEMP, M_WAITOK);
+ error = sooptcopyin(sopt, p, sizeof(struct dn_pipe), sizeof *p);
if (error)
break ;
error = delete_pipe(p);
break ;
}
+ if (p != NULL)
+ free(p, M_TEMP);
return error ;
}
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