3.16.37-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Sven Eckelmann <sven.eckelmann@xxxxxxxxxxxxx>
commit d285f52cc0f23564fd61976d43fd5b991b4828f6 upstream.
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@xxxxxxxxxxxxx>
Signed-off-by: Marek Lindner <mareklindner@xxxxxxxxxxxxx>
Signed-off-by: Antonio Quartulli <a@xxxxxxxxxxx>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
net/batman-adv/bat_iv_ogm.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -1134,9 +1134,10 @@ static int batadv_iv_ogm_calc_tq(struct
uint8_t total_count;
uint8_t 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, ret = 0;
+ int if_num, ret = 0;
+ unsigned int tq_asym_penalty, inv_asym_penalty;
unsigned int combined_tq;
- int tq_iface_penalty;
+ unsigned int tq_iface_penalty;
/* find corresponding one hop neighbor */
rcu_read_lock();
--
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