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SubjectRe: [PATCH] net: sched: sch: Bounds check priority
On Fri, Jan 27, 2023 at 02:40:37PM -0800, Kees Cook wrote:
> Nothing was explicitly bounds checking the priority index used to access
> clpriop[]. WARN and bail out early if it's pathological. Seen with GCC 13:
>
> ../net/sched/sch_htb.c: In function 'htb_activate_prios':
> ../net/sched/sch_htb.c:437:44: warning: array subscript [0, 31] is outside array bounds of 'struct htb_prio[8]' [-Warray-bounds=]
> 437 | if (p->inner.clprio[prio].feed.rb_node)
> | ~~~~~~~~~~~~~~~^~~~~~
> ../net/sched/sch_htb.c:131:41: note: while referencing 'clprio'
> 131 | struct htb_prio clprio[TC_HTB_NUMPRIO];
> | ^~~~~~

Reviewed-by: Cong Wang <cong.wang@bytedance.com>

We already have a check in htb_change_class():

2056 if ((cl->prio = hopt->prio) >= TC_HTB_NUMPRIO)
2057 cl->prio = TC_HTB_NUMPRIO - 1;

so this patch is just to make GCC 13 happy.

Thanks.

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