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sch_netem: fix a divide by zero in tabledist()

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[ Upstream commit b41d936b5e ]

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: 1da177e4c3 ("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>
This commit is contained in:
Eric Dumazet 2019-09-18 08:05:39 -07:00 committed by Greg Kroah-Hartman
parent ac7ac130d9
commit 9850f9307d
1 changed files with 1 additions and 1 deletions
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2
net/sched/sch_netem.c
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@ -711,7 +711,7 @@ static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr)
int i;
size_t s;
if (n > NETEM_DIST_MAX)
if (!n || n > NETEM_DIST_MAX)
return -EINVAL;
s = sizeof(struct disttable) + n * sizeof(s16);