From c358f1857f0c749ad166fb9e9bef04f4033f3a72 Mon Sep 17 00:00:00 2001 From: Richard Scheffenegger Date: Wed, 26 May 2021 19:45:06 +0200 Subject: [PATCH] tcp: Use local CC data only in the correct context Most CC algos do use local data, and when calling newreno_cong_signal from there, the latter misinterprets the data as its own struct, leading to incorrect behavior. Reported by: chengc_netapp.com Reviewed By: chengc_netapp.com, tuexen, #transport MFC after: 3 days Sponsored By: NetApp, Inc. Differential Revision: https://reviews.freebsd.org/D30470 --- sys/netinet/cc/cc_newreno.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/sys/netinet/cc/cc_newreno.c b/sys/netinet/cc/cc_newreno.c index 5f91ad8d1e7b..8f8ca953169e 100644 --- a/sys/netinet/cc/cc_newreno.c +++ b/sys/netinet/cc/cc_newreno.c @@ -239,7 +239,12 @@ newreno_cong_signal(struct cc_var *ccv, uint32_t type) cwin = CCV(ccv, snd_cwnd); mss = tcp_fixed_maxseg(ccv->ccvc.tcp); - nreno = ccv->cc_data; + /* + * Other TCP congestion controls use newreno_cong_signal(), but + * with their own private cc_data. Make sure the cc_data is used + * correctly. + */ + nreno = (CC_ALGO(ccv->ccvc.tcp) == &newreno_cc_algo) ? ccv->cc_data : NULL; beta = (nreno == NULL) ? V_newreno_beta : nreno->beta; beta_ecn = (nreno == NULL) ? V_newreno_beta_ecn : nreno->beta_ecn; @@ -336,6 +341,9 @@ newreno_ctl_output(struct cc_var *ccv, struct sockopt *sopt, void *buf) if (sopt->sopt_valsize != sizeof(struct cc_newreno_opts)) return (EMSGSIZE); + if (CC_ALGO(ccv->ccvc.tcp) != &newreno_cc_algo) + return (ENOPROTOOPT); + nreno = ccv->cc_data; opt = buf;