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From: Artem Savkov <asavkov@redhat.com>
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Subject: [RHEL-7.9 CVE-2021-3715 KPATCH] net_sched: cls_route: remove the right filter from hashtable
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Date: Mon, 30 Aug 2021 17:33:51 +0200
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Kernels:
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3.10.0-1160.el7
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3.10.0-1160.2.1.el7
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3.10.0-1160.2.2.el7
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3.10.0-1160.6.1.el7
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3.10.0-1160.11.1.el7
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3.10.0-1160.15.2.el7
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3.10.0-1160.21.1.el7
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3.10.0-1160.24.1.el7
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3.10.0-1160.25.1.el7
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3.10.0-1160.31.1.el7
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3.10.0-1160.36.2.el7
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3.10.0-1160.41.1.el7
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Changes since last build:
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arches: x86_64 ppc64le
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cls_route.o: changed function: route4_change
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---------------------------
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Kernels:
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3.10.0-1160.41.1.el7
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Modifications: none
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Z-MR: https://gitlab.com/redhat/rhel/src/kernel/rhel-7/-/merge_requests/251
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commit f4e1814eb56167451ddd819fccb951178f97660b
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Author: Ivan Vecera <ivecera@redhat.com>
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Date: Tue Aug 17 12:21:33 2021 +0200
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net_sched: cls_route: remove the right filter from hashtable
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1992926
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commit ef299cc3fa1a9e1288665a9fdc8bff55629fd359
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Author: Cong Wang <xiyou.wangcong@gmail.com>
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Date: Fri Mar 13 22:29:54 2020 -0700
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net_sched: cls_route: remove the right filter from hashtable
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route4_change() allocates a new filter and copies values from
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the old one. After the new filter is inserted into the hash
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table, the old filter should be removed and freed, as the final
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step of the update.
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However, the current code mistakenly removes the new one. This
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looks apparently wrong to me, and it causes double "free" and
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use-after-free too, as reported by syzbot.
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Reported-and-tested-by: syzbot+f9b32aaacd60305d9687@syzkaller.appspotmail.com
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Reported-and-tested-by: syzbot+2f8c233f131943d6056d@syzkaller.appspotmail.com
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Reported-and-tested-by: syzbot+9c2df9fd5e9445b74e01@syzkaller.appspotmail.com
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Fixes: 1109c00547fc ("net: sched: RCU cls_route")
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Cc: Jamal Hadi Salim <jhs@mojatatu.com>
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Cc: Jiri Pirko <jiri@resnulli.us>
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Cc: John Fastabend <john.fastabend@gmail.com>
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Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Ivan Vecera <ivecera@redhat.com>
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Signed-off-by: Artem Savkov <asavkov@redhat.com>
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Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
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---
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net/sched/cls_route.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
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index 7bd464e8d084..2fed29fa504e 100644
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--- a/net/sched/cls_route.c
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+++ b/net/sched/cls_route.c
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@@ -534,8 +534,8 @@ static int route4_change(struct net *net, struct sk_buff *in_skb,
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fp = &b->ht[h];
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for (pfp = rtnl_dereference(*fp); pfp;
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fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
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- if (pfp == f) {
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- *fp = f->next;
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+ if (pfp == fold) {
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+ rcu_assign_pointer(*fp, fold->next);
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break;
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}
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}
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--
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2.31.1
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