[PATCH] sched/deadline: fix task_struct reference leak

From: Wander Lairson Costa
Date: Tue Jun 18 2024 - 16:20:33 EST


During the execution of the following stress test with linux-rt:

stress-ng --cyclic 30 --timeout 30 --minimize --quiet

kmemleak frequently reported a memory leak concerning the task_struct:

unreferenced object 0xffff8881305b8000 (size 16136):
comm "stress-ng", pid 614, jiffies 4294883961 (age 286.412s)
object hex dump (first 32 bytes):
02 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 .@..............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
debug hex dump (first 16 bytes):
53 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 S...............
backtrace:
[<00000000046b6790>] dup_task_struct+0x30/0x540
[<00000000c5ca0f0b>] copy_process+0x3d9/0x50e0
[<00000000ced59777>] kernel_clone+0xb0/0x770
[<00000000a50befdc>] __do_sys_clone+0xb6/0xf0
[<000000001dbf2008>] do_syscall_64+0x5d/0xf0
[<00000000552900ff>] entry_SYSCALL_64_after_hwframe+0x6e/0x76

The issue occurs in start_dl_timer(), which increments the task_struct
reference count and sets a timer. The timer callback, dl_task_timer,
is supposed to decrement the reference count upon expiration. However,
if enqueue_task_dl() is called before the timer expires and cancels it,
the reference count is not decremented, leading to the leak.

This patch fixes the reference leak by ensuring the task_struct
reference count is properly decremented when the timer is canceled.

Signed-off-by: Wander Lairson Costa <wander@xxxxxxxxxx>
---
kernel/sched/deadline.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index c75d1307d86d..5953f89bfa96 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1805,7 +1805,9 @@ static void enqueue_task_dl(struct rq *rq, struct task_struct *p, int flags)
* problem if it fires concurrently: boosted threads
* are ignored in dl_task_timer().
*/
- hrtimer_try_to_cancel(&p->dl.dl_timer);
+ if (hrtimer_try_to_cancel(&p->dl.dl_timer) == 1 &&
+ !dl_server(&p->dl))
+ put_task_struct(p);
p->dl.dl_throttled = 0;
}
} else if (!dl_prio(p->normal_prio)) {
--
2.45.1