diff options
| author | M A Ramdhan <ramdhan@starlabs.sg> | 2023-07-05 19:15:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-08-11 12:33:54 +0300 |
| commit | fa020e39526994c7248f241f75d615b0df5d7671 (patch) | |
| tree | 362d318ed83c1e12557a3335ec06df1e039887ad /net/sched | |
| parent | d3009700f48602b557eade1f22c98b6bc20247e8 (diff) | |
| download | linux-fa020e39526994c7248f241f75d615b0df5d7671.tar.xz | |
net/sched: cls_fw: Fix improper refcount update leads to use-after-free
commit 0323bce598eea038714f941ce2b22541c46d488f upstream.
In the event of a failure in tcf_change_indev(), fw_set_parms() will
immediately return an error after incrementing or decrementing
reference counter in tcf_bind_filter(). If attacker can control
reference counter to zero and make reference freed, leading to
use after free.
In order to prevent this, move the point of possible failure above the
point where the TC_FW_CLASSID is handled.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: M A Ramdhan <ramdhan@starlabs.sg>
Signed-off-by: M A Ramdhan <ramdhan@starlabs.sg>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>
Message-ID: <20230705161530.52003-1-ramdhan@starlabs.sg>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/cls_fw.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c index 7f45e5ab8afc..e63f9c2e37e5 100644 --- a/net/sched/cls_fw.c +++ b/net/sched/cls_fw.c @@ -225,11 +225,6 @@ static int fw_set_parms(struct net *net, struct tcf_proto *tp, if (err < 0) return err; - if (tb[TCA_FW_CLASSID]) { - f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]); - tcf_bind_filter(tp, &f->res, base); - } - #ifdef CONFIG_NET_CLS_IND if (tb[TCA_FW_INDEV]) { int ret; @@ -248,6 +243,11 @@ static int fw_set_parms(struct net *net, struct tcf_proto *tp, } else if (head->mask != 0xFFFFFFFF) return err; + if (tb[TCA_FW_CLASSID]) { + f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]); + tcf_bind_filter(tp, &f->res, base); + } + return 0; } |