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diff --git a/sys/netinet/cc/cc_newreno.c b/sys/netinet/cc/cc_newreno.c
--- a/sys/netinet/cc/cc_newreno.c
+++ b/sys/netinet/cc/cc_newreno.c
@@ -259,9 +259,9 @@
if (IN_CONGRECOVERY(CCV(ccv, t_flags) &&
V_cc_do_abe && V_cc_abe_frlossreduce)) {
CCV(ccv, snd_ssthresh) =
- ((uint64_t)CCV(ccv, snd_ssthresh) *
- (uint64_t)beta) /
- (100ULL * (uint64_t)beta_ecn);
+ max(((uint64_t)CCV(ccv, snd_ssthresh) *
+ (uint64_t)beta) / (uint64_t)beta_ecn,
+ 2 * mss);
}
if (!IN_CONGRECOVERY(CCV(ccv, t_flags)))
CCV(ccv, snd_ssthresh) = cwin;
@@ -341,11 +341,15 @@
}
switch (opt->name) {
case CC_NEWRENO_BETA:
+ if (opt->val == 0 || opt->val > 100)
+ return (EINVAL);
nreno->beta = opt->val;
break;
case CC_NEWRENO_BETA_ECN:
if (!V_cc_do_abe)
return (EACCES);
+ if (opt->val == 0 || opt->val > 100)
+ return (EINVAL);
nreno->beta_ecn = opt->val;
break;
default:

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