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net_sched: red: Avoid illegal values

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Check the qmin & qmax values doesn't overflow for the given Wlog value.
Check that qmin <= qmax.

Fixes: a783474591 ("[PKT_SCHED]: Generic RED layer")
Signed-off-by: Nogah Frankel <nogahf@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nogah Frankel 2017-12-04 13:31:11 +02:00 • committed by David S. Miller
parent 5c47220342
commit 8afa10cbe2
5 changed files with 22 additions and 0 deletions
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11
include/net/red.h
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@ -168,6 +168,17 @@ static inline void red_set_vars(struct red_vars *v)
v->qcount = -1;
}
static inline bool red_check_params(u32 qth_min, u32 qth_max, u8 Wlog)
{
if (fls(qth_min) + Wlog > 32)
return false;
if (fls(qth_max) + Wlog > 32)
return false;
if (qth_max < qth_min)
return false;
return true;
}
static inline void red_set_parms(struct red_parms *p,
u32 qth_min, u32 qth_max, u8 Wlog, u8 Plog,
u8 Scell_log, u8 *stab, u32 max_P)