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mcctrl: delete procfs entries recursively to avoid leaking

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This commit is contained in:
Balazs Gerofi
2016-01-21 18:12:26 +09:00
parent dbddf37579
commit 425f920013
1 changed files with 48 additions and 21 deletions
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69
executer/kernel/mcctrl/procfs.c
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@ -266,6 +266,52 @@ quit:
dprintk("procfs_create: done\n");
}
/**
* \brief Delete a procfs entry and all of its subtree (internal).
*
* \param __os (opaque) os variable
* \param osnum os number
*
* NOTE: procfs_file_list_lock has to be held here.
*/
void __procfs_delete_entry_recursively(struct procfs_list_entry *e)
{
struct procfs_list_entry *le;
struct procfs_list_entry *parent = NULL;
char name[PROCFS_NAME_MAX];
char *r;
/* See if there are any children of this entry */
retry:
list_for_each_entry(le, &procfs_file_list, list) {
if (le->parent != e) {
continue;
}
__procfs_delete_entry_recursively(le);
/* List may have changed... */
goto retry;
}
/* No more children, remove entry */
list_del(&e->list);
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0)
e->entry->read_proc = NULL;
e->entry->data = NULL;
#endif
parent = e->parent;
r = strrchr(e->fname, '/');
if (r == NULL) {
strncpy(name, e->fname, PROCFS_NAME_MAX);
} else {
strncpy(name, r + 1, PROCFS_NAME_MAX);
}
dprintk("found and removed %s from the list.\n", name);
remove_proc_entry(name, parent->entry);
kfree(e);
}
/**
* \brief Delete a procfs entry (internal).
*
@ -273,34 +319,15 @@ quit:
* \param osnum os number
*/
/* TODO: detect when a directory becomes empty remove it automatically */
void procfs_delete_entry(void *os, int osnum, char *fname)
{
struct procfs_list_entry *e;
struct procfs_list_entry *parent = NULL;
char name[PROCFS_NAME_MAX];
char *r;
unsigned long irqflags;
irqflags = ihk_ikc_spinlock_lock(&procfs_file_list_lock);
list_for_each_entry(e, &procfs_file_list, list) {
if ((strncmp(e->fname, fname, PROCFS_NAME_MAX) == 0) &&
(e->osnum == osnum)) {
list_del(&e->list);
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0)
e->entry->read_proc = NULL;
e->entry->data = NULL;
#endif
parent = e->parent;
kfree(e);
r = strrchr(fname, '/');
if (r == NULL) {
strncpy(name, fname, PROCFS_NAME_MAX);
} else {
strncpy(name, r + 1, PROCFS_NAME_MAX);
}
printk("found and remove %s from the list.\n", name);
remove_proc_entry(name, parent->entry);
if ((strncmp(e->fname, fname, PROCFS_NAME_MAX) == 0) && (e->osnum == osnum)) {
__procfs_delete_entry_recursively(e);
break;
}
}