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neigh: prevent overflowing params in /proc/sys/net/ipv4/neigh/ 

Without this patch, the fields app_solicit, gc_thresh1, gc_thresh2,
gc_thresh3, proxy_qlen, ucast_solicit, mcast_solicit could have
assumed negative values when setting large numbers.

Signed-off-by: Francesco Fusco <ffusco@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Francesco Fusco 2013-07-24 10:39:06 +02:00 committed by syphyr
parent bd547dc68c
commit 3663cc75c7
1 changed files with 22 additions and 7 deletions
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29
net/core/neighbour.c
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@ -2791,6 +2791,7 @@ EXPORT_SYMBOL(neigh_app_ns);
#ifdef CONFIG_SYSCTL
static int zero;
static int int_max = INT_MAX;
static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN);
static int proc_unres_qlen(ctl_table *ctl, int write, void __user *buffer,
@ -2844,19 +2845,25 @@ static struct neigh_sysctl_table {
.procname = "mcast_solicit",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
.extra1 = &zero,
.extra2 = &int_max,
.proc_handler = proc_dointvec_minmax,
},
[NEIGH_VAR_UCAST_PROBE] = {
.procname = "ucast_solicit",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
.extra1 = &zero,
.extra2 = &int_max,
.proc_handler = proc_dointvec_minmax,
},
[NEIGH_VAR_APP_PROBE] = {
.procname = "app_solicit",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
.extra1 = &zero,
.extra2 = &int_max,
.proc_handler = proc_dointvec_minmax,
},
[NEIGH_VAR_RETRANS_TIME] = {
.procname = "retrans_time",
@ -2899,7 +2906,9 @@ static struct neigh_sysctl_table {
.procname = "proxy_qlen",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
.extra1 = &zero,
.extra2 = &int_max,
.proc_handler = proc_dointvec_minmax,
},
[NEIGH_VAR_ANYCAST_DELAY] = {
.procname = "anycast_delay",
@ -2941,19 +2950,25 @@ static struct neigh_sysctl_table {
.procname = "gc_thresh1",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
.extra1 = &zero,
.extra2 = &int_max,
.proc_handler = proc_dointvec_minmax,
},
[NEIGH_VAR_GC_THRESH2] = {
.procname = "gc_thresh2",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
.extra1 = &zero,
.extra2 = &int_max,
.proc_handler = proc_dointvec_minmax,
},
[NEIGH_VAR_GC_THRESH3] = {
.procname = "gc_thresh3",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
.extra1 = &zero,
.extra2 = &int_max,
.proc_handler = proc_dointvec_minmax,
},
[NEIGH_VAR_PROBE] = {
.procname = "neigh_probe",