convert_prio() can return an undefined value when called with an
out-of-range priority because 'cpupri' is not initialized on the default
path.
Initialize 'cpupri' to 'CPUPRI_INVALID' and warn once on invalid input,
keeping behavior deterministic for unexpected priorities.
Fixes: 6e0534f27819 ("sched: use a 2-d bitmap for searching lowest-pri CPU")
Cc: stable@vger.kernel.org
Assisted-by: Codex:GPT-5
Signed-off-by: Joseph Salisbury <joseph.salisbury@oracle.com>
---
kernel/sched/cpupri.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/cpupri.c b/kernel/sched/cpupri.c
index 8f2237e8b484..b905a6bfac0c 100644
--- a/kernel/sched/cpupri.c
+++ b/kernel/sched/cpupri.c
@@ -42,7 +42,7 @@
*/
static int convert_prio(int prio)
{
- int cpupri;
+ int cpupri = CPUPRI_INVALID;
switch (prio) {
case CPUPRI_INVALID:
@@ -60,6 +60,10 @@ static int convert_prio(int prio)
case MAX_RT_PRIO:
cpupri = CPUPRI_HIGHER; /* 100 */
break;
+
+ default:
+ WARN_ON_ONCE(prio < 0 || prio > MAX_RT_PRIO);
+ break;
}
return cpupri;
--
2.47.3