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Revision 64b4c411a6c7a5f27555bfc2d6310b87bde3db67 authored by Andrew Morton on 21 October 2022, 04:19:22 UTC, committed by Andrew Morton on 28 October 2022, 20:37:22 UTC 
ipc/msg.c: fix percpu_counter use after free
 
These percpu counters are referenced in free_ipcs->freeque, so destroy
them later.

Fixes: 72d1e611082e ("ipc/msg: mitigate the lock contention with percpu counter")
Reported-by: syzbot+96e659d35b9d6b541152@syzkaller.appspotmail.com
Tested-by: Mark Rutland <mark.rutland@arm.com>
Cc: Jiebin Sun <jiebin.sun@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
1 parent 27d676a
Raw File
latencytop.h 
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * latencytop.h: Infrastructure for displaying latency
 *
 * (C) Copyright 2008 Intel Corporation
 * Author: Arjan van de Ven <arjan@linux.intel.com>
 *
 */

#ifndef _INCLUDE_GUARD_LATENCYTOP_H_
#define _INCLUDE_GUARD_LATENCYTOP_H_

#include <linux/compiler.h>
struct task_struct;

#ifdef CONFIG_LATENCYTOP

#define LT_SAVECOUNT		32
#define LT_BACKTRACEDEPTH	12

struct latency_record {
	unsigned long	backtrace[LT_BACKTRACEDEPTH];
	unsigned int	count;
	unsigned long	time;
	unsigned long	max;
};



extern int latencytop_enabled;
void __account_scheduler_latency(struct task_struct *task, int usecs, int inter);
static inline void
account_scheduler_latency(struct task_struct *task, int usecs, int inter)
{
	if (unlikely(latencytop_enabled))
		__account_scheduler_latency(task, usecs, inter);
}

void clear_tsk_latency_tracing(struct task_struct *p);

#else

static inline void
account_scheduler_latency(struct task_struct *task, int usecs, int inter)
{
}

static inline void clear_tsk_latency_tracing(struct task_struct *p)
{
}

#endif

#endif
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