diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-05-22 20:37:44 +0000 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2012-08-17 15:34:57 -0400 |
| commit | c88f1d0ac1138655c607b21d4eb7f2d45013ffc8 (patch) | |
| tree | 096080790b575c37a1ebfb1609eba48593bb250e /net | |
| parent | 744f2110ae5939ebb75b2a3dd57ec64708481f82 (diff) | |
net_sched: Fix qdisc_notify()
commit 53b0f08042f04813cd1a7473dacd3edfacb28eb3 upstream.
Ben Pfaff reported a kernel oops and provided a test program to
reproduce it.
https://kerneltrap.org/mailarchive/linux-netdev/2010/5/21/6277805
tc_fill_qdisc() should not be called for builtin qdisc, or it
dereference a NULL pointer to get device ifindex.
Fix is to always use tc_qdisc_dump_ignore() before calling
tc_fill_qdisc().
Reported-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/sch_api.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 145268ca57cf..df1dbf55ad7e 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1196,6 +1196,11 @@ nla_put_failure: return -1; } +static bool tc_qdisc_dump_ignore(struct Qdisc *q) +{ + return (q->flags & TCQ_F_BUILTIN) ? true : false; +} + static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, u32 clid, struct Qdisc *old, struct Qdisc *new) { @@ -1206,11 +1211,11 @@ static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, if (!skb) return -ENOBUFS; - if (old && old->handle) { + if (old && !tc_qdisc_dump_ignore(old)) { if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) goto err_out; } - if (new) { + if (new && !tc_qdisc_dump_ignore(new)) { if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) goto err_out; } @@ -1223,11 +1228,6 @@ err_out: return -EINVAL; } -static bool tc_qdisc_dump_ignore(struct Qdisc *q) -{ - return (q->flags & TCQ_F_BUILTIN) ? true : false; -} - static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, struct netlink_callback *cb, int *q_idx_p, int s_q_idx) |