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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2014-04-13 09:34:53 -0400
committerShow Liu <show.liu@linaro.org>2014-06-18 12:05:16 +0800
commitbeac26b26bf930fa196eeb2d74b0b0d296cc960b (patch)
tree5e45d1f1ebb9c0a36e007c3fa1d708abffe94ce2
parentce587b250ef4dc917ac0369b3df06ec6997fb4d0 (diff)
downloadlinaro-lsk-beac26b26bf930fa196eeb2d74b0b0d296cc960b.tar.gz
sched: Use CPUPRI_NR_PRIORITIES instead of MAX_RT_PRIO in cpupri check
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@gmail.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1397015410.5212.13.camel@marge.simpson.net Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--kernel/sched/cpupri.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/sched/cpupri.c b/kernel/sched/cpupri.c
index 8b836b376d9..3031bac8aa3 100644
--- a/kernel/sched/cpupri.c
+++ b/kernel/sched/cpupri.c
@@ -70,8 +70,7 @@ int cpupri_find(struct cpupri *cp, struct task_struct *p,
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];