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If potentially no valid element is found, 'p' would contain an invalid pointer past the iterator loop. To ensure 'p' is valid under any circumstances, the kfree() should be within the loop body. Additionally, Linus proposed to avoid any use of the list iterator variable after the loop, in the attempt to move the list iterator variable declaration into the macro to avoid any potential misuse after the loop [1]. Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1] Signed-off-by: Jakob Koschel <jkl820.git@gmail.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20230301-watchdog-avoid-iter-after-loop-v2-1-8411e3bbe0de@gmail.com Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
216 lines
4.5 KiB
C
216 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2015-2016 Mentor Graphics
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*/
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/watchdog.h>
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#include "watchdog_core.h"
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#include "watchdog_pretimeout.h"
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/* Default watchdog pretimeout governor */
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static struct watchdog_governor *default_gov;
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/* The spinlock protects default_gov, wdd->gov and pretimeout_list */
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static DEFINE_SPINLOCK(pretimeout_lock);
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/* List of watchdog devices, which can generate a pretimeout event */
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static LIST_HEAD(pretimeout_list);
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struct watchdog_pretimeout {
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struct watchdog_device *wdd;
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struct list_head entry;
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};
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/* The mutex protects governor list and serializes external interfaces */
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static DEFINE_MUTEX(governor_lock);
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/* List of the registered watchdog pretimeout governors */
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static LIST_HEAD(governor_list);
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struct governor_priv {
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struct watchdog_governor *gov;
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struct list_head entry;
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};
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static struct governor_priv *find_governor_by_name(const char *gov_name)
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{
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struct governor_priv *priv;
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list_for_each_entry(priv, &governor_list, entry)
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if (sysfs_streq(gov_name, priv->gov->name))
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return priv;
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return NULL;
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}
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int watchdog_pretimeout_available_governors_get(char *buf)
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{
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struct governor_priv *priv;
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int count = 0;
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mutex_lock(&governor_lock);
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list_for_each_entry(priv, &governor_list, entry)
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count += sysfs_emit_at(buf, count, "%s\n", priv->gov->name);
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mutex_unlock(&governor_lock);
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return count;
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}
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int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf)
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{
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int count = 0;
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spin_lock_irq(&pretimeout_lock);
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if (wdd->gov)
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count = sysfs_emit(buf, "%s\n", wdd->gov->name);
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spin_unlock_irq(&pretimeout_lock);
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return count;
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}
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int watchdog_pretimeout_governor_set(struct watchdog_device *wdd,
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const char *buf)
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{
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struct governor_priv *priv;
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mutex_lock(&governor_lock);
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priv = find_governor_by_name(buf);
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if (!priv) {
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mutex_unlock(&governor_lock);
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return -EINVAL;
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}
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spin_lock_irq(&pretimeout_lock);
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wdd->gov = priv->gov;
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spin_unlock_irq(&pretimeout_lock);
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mutex_unlock(&governor_lock);
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return 0;
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}
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void watchdog_notify_pretimeout(struct watchdog_device *wdd)
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{
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unsigned long flags;
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spin_lock_irqsave(&pretimeout_lock, flags);
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if (!wdd->gov) {
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spin_unlock_irqrestore(&pretimeout_lock, flags);
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return;
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}
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wdd->gov->pretimeout(wdd);
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spin_unlock_irqrestore(&pretimeout_lock, flags);
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}
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EXPORT_SYMBOL_GPL(watchdog_notify_pretimeout);
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int watchdog_register_governor(struct watchdog_governor *gov)
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{
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struct watchdog_pretimeout *p;
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struct governor_priv *priv;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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mutex_lock(&governor_lock);
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if (find_governor_by_name(gov->name)) {
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mutex_unlock(&governor_lock);
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kfree(priv);
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return -EBUSY;
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}
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priv->gov = gov;
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list_add(&priv->entry, &governor_list);
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if (!strncmp(gov->name, WATCHDOG_PRETIMEOUT_DEFAULT_GOV,
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WATCHDOG_GOV_NAME_MAXLEN)) {
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spin_lock_irq(&pretimeout_lock);
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default_gov = gov;
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list_for_each_entry(p, &pretimeout_list, entry)
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if (!p->wdd->gov)
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p->wdd->gov = default_gov;
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spin_unlock_irq(&pretimeout_lock);
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}
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mutex_unlock(&governor_lock);
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return 0;
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}
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EXPORT_SYMBOL(watchdog_register_governor);
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void watchdog_unregister_governor(struct watchdog_governor *gov)
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{
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struct watchdog_pretimeout *p;
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struct governor_priv *priv, *t;
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mutex_lock(&governor_lock);
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list_for_each_entry_safe(priv, t, &governor_list, entry) {
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if (priv->gov == gov) {
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list_del(&priv->entry);
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kfree(priv);
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break;
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}
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}
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spin_lock_irq(&pretimeout_lock);
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list_for_each_entry(p, &pretimeout_list, entry)
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if (p->wdd->gov == gov)
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p->wdd->gov = default_gov;
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spin_unlock_irq(&pretimeout_lock);
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mutex_unlock(&governor_lock);
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}
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EXPORT_SYMBOL(watchdog_unregister_governor);
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int watchdog_register_pretimeout(struct watchdog_device *wdd)
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{
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struct watchdog_pretimeout *p;
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if (!watchdog_have_pretimeout(wdd))
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return 0;
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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spin_lock_irq(&pretimeout_lock);
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list_add(&p->entry, &pretimeout_list);
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p->wdd = wdd;
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wdd->gov = default_gov;
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spin_unlock_irq(&pretimeout_lock);
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return 0;
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}
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void watchdog_unregister_pretimeout(struct watchdog_device *wdd)
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{
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struct watchdog_pretimeout *p, *t;
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if (!watchdog_have_pretimeout(wdd))
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return;
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spin_lock_irq(&pretimeout_lock);
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wdd->gov = NULL;
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list_for_each_entry_safe(p, t, &pretimeout_list, entry) {
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if (p->wdd == wdd) {
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list_del(&p->entry);
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kfree(p);
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break;
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}
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}
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spin_unlock_irq(&pretimeout_lock);
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}
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