This is a note to let you know that I've just added the patch titled
sched: Use CPUPRI_NR_PRIORITIES instead of MAX_RT_PRIO in cpupri check
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sched-use-cpupri_nr_priorities-instead-of-max_rt_prio-in-cpupri-check.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6227cb00cc120f9a43ce8313bb0475ddabcb7d01 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>
Date: Sun, 13 Apr 2014 09:34:53 -0400
Subject: sched: Use CPUPRI_NR_PRIORITIES instead of MAX_RT_PRIO in cpupri check
From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>
commit 6227cb00cc120f9a43ce8313bb0475ddabcb7d01 upstream.
The check at the beginning of cpupri_find() makes sure that the task_pri
variable does not exceed the cp->pri_to_cpu array length. But that length
is CPUPRI_NR_PRIORITIES not MAX_RT_PRIO, where it will miss the last two
priorities in that array.
As task_pri is computed from convert_prio() which should never be bigger
than CPUPRI_NR_PRIORITIES, if the check should cause a panic if it is
hit.
Reported-by: Mike Galbraith <umgwanakikbuti@xxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1397015410.5212.13.camel@xxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/cpupri.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/kernel/sched/cpupri.c
+++ b/kernel/sched/cpupri.c
@@ -68,8 +68,7 @@ int cpupri_find(struct cpupri *cp, struc
int idx = 0;
int task_pri = convert_prio(p->prio);
- if (task_pri >= MAX_RT_PRIO)
- return 0;
+ BUG_ON(task_pri >= CPUPRI_NR_PRIORITIES);
for (idx = 0; idx < task_pri; idx++) {
struct cpupri_vec *vec = &cp->pri_to_cpu[idx];
Patches currently in stable-queue which might be from rostedt@xxxxxxxxxxx are
queue-3.4/sched-use-cpupri_nr_priorities-instead-of-max_rt_prio-in-cpupri-check.patch
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