diff options
| author | Eric Dumazet <edumazet@google.com> | 2019-09-18 08:05:39 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-05 13:09:29 +0200 |
| commit | 9a623e1b1d0359056ec3aeb73d24fd411a14bfc4 (patch) | |
| tree | 81de5fe33e21080446c1ef781bef43c84bba5592 | |
| parent | 1cd663adcececc108c8783be3f71c6a79641097d (diff) | |
| download | linux-rt-9a623e1b1d0359056ec3aeb73d24fd411a14bfc4.tar.gz | |
sch_netem: fix a divide by zero in tabledist()
[ Upstream commit b41d936b5ecfdb3a4abc525ce6402a6c49cffddc ]
syzbot managed to crash the kernel in tabledist() loading
an empty distribution table.
t = dist->table[rnd % dist->size];
Simply return an error when such load is attempted.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/sched/sch_netem.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index 4dfe10b9f96c..86350fe5cfc8 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -749,7 +749,7 @@ static int get_dist_table(struct Qdisc *sch, struct disttable **tbl, struct disttable *d; int i; - if (n > NETEM_DIST_MAX) + if (!n || n > NETEM_DIST_MAX) return -EINVAL; d = kvmalloc(sizeof(struct disttable) + n * sizeof(s16), GFP_KERNEL); |