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| author | Sven Eckelmann <sven.eckelmann@open-mesh.com> | 2016-02-16 10:47:07 +0100 |
|---|---|---|
| committer | Antonio Quartulli <a@unstable.cc> | 2016-05-18 11:49:42 +0800 |
| commit | d285f52cc0f23564fd61976d43fd5b991b4828f6 (patch) | |
| tree | cb94178c532da21ddc3a53a82665bcaef9e1645a /net/batman-adv/bat_iv_ogm.c | |
| parent | 1653f61d656516aae7130db19561258a847d1e94 (diff) | |
| download | linux-0-day-d285f52cc0f23564fd61976d43fd5b991b4828f6.tar.gz linux-0-day-d285f52cc0f23564fd61976d43fd5b991b4828f6.tar.xz | |
batman-adv: Fix integer overflow in batadv_iv_ogm_calc_tq
The undefined behavior sanatizer detected an signed integer overflow in a
setup with near perfect link quality
UBSAN: Undefined behaviour in net/batman-adv/bat_iv_ogm.c:1246:25
signed integer overflow:
8713350 * 255 cannot be represented in type 'int'
The problems happens because the calculation of mixed unsigned and signed
integers resulted in an integer multiplication.
batadv_ogm_packet::tq (u8 255)
* tq_own (u8 255)
* tq_asym_penalty (int 134; max 255)
* tq_iface_penalty (int 255; max 255)
The tq_iface_penalty, tq_asym_penalty and inv_asym_penalty can just be
changed to unsigned int because they are not expected to become negative.
Fixes: c039876892e3 ("batman-adv: add WiFi penalty")
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
Diffstat (limited to 'net/batman-adv/bat_iv_ogm.c')
| -rw-r--r-- | net/batman-adv/bat_iv_ogm.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index 1b5bbafc0fa3f..ce2f203048d35 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -1180,9 +1180,10 @@ static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, u8 total_count; u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; - int tq_asym_penalty, inv_asym_penalty, if_num; + int if_num; + unsigned int tq_asym_penalty, inv_asym_penalty; unsigned int combined_tq; - int tq_iface_penalty; + unsigned int tq_iface_penalty; bool ret = false; /* find corresponding one hop neighbor */ |