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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2019-09-18 16:24:12 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-05 13:13:15 +0200 |
| commit | ba5f359f2be0e0f36c848a68deb6d4c4229ae1c8 (patch) | |
| tree | 77be066d7d2d2ba72560efc98c5fc4ea1aa7ae0e /net | |
| parent | 19bd1045958b983a30023c09fcb84f049c6c5038 (diff) | |
| download | linux-stable-ba5f359f2be0e0f36c848a68deb6d4c4229ae1c8.tar.gz linux-stable-ba5f359f2be0e0f36c848a68deb6d4c4229ae1c8.tar.bz2 linux-stable-ba5f359f2be0e0f36c848a68deb6d4c4229ae1c8.zip | |
net_sched: add max len check for TCA_KIND
[ Upstream commit 62794fc4fbf52f2209dc094ea255eaef760e7d01 ]
The TCA_KIND attribute is of NLA_STRING which does not check
the NUL char. KMSAN reported an uninit-value of TCA_KIND which
is likely caused by the lack of NUL.
Change it to NLA_NUL_STRING and add a max len too.
Fixes: 8b4c3cdd9dd8 ("net: sched: Add policy validation for tc attributes")
Reported-and-tested-by: syzbot+618aacd49e8c8b8486bd@syzkaller.appspotmail.com
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/sch_api.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 1047825d9f48..81d58b280612 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1390,7 +1390,8 @@ check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) } const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = { - [TCA_KIND] = { .type = NLA_STRING }, + [TCA_KIND] = { .type = NLA_NUL_STRING, + .len = IFNAMSIZ - 1 }, [TCA_RATE] = { .type = NLA_BINARY, .len = sizeof(struct tc_estimator) }, [TCA_STAB] = { .type = NLA_NESTED }, |