drm: move drm authentication to new generic hash table.
Fix drm_remove_magic potential memory leak / corruption. Move drm authentication token hashing to new generic hash table implementation. Signed-off-by: Dave Airlie <airlied@linux.ie>
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3d45dbd611
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@ -105,7 +105,7 @@
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#define DRM_DEBUG_CODE 2 /**< Include debugging code if > 1, then
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also include looping detection. */
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#define DRM_HASH_SIZE 16 /**< Size of key hash table. Must be power of 2. */
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#define DRM_MAGIC_HASH_ORDER 4 /**< Size of key hash table. Must be power of 2. */
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#define DRM_KERNEL_CONTEXT 0 /**< Change drm_resctx if changed */
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#define DRM_RESERVED_CONTEXTS 1 /**< Change drm_resctx if changed */
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#define DRM_LOOPING_LIMIT 5000000
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@ -277,7 +277,8 @@ typedef struct drm_devstate {
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} drm_devstate_t;
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typedef struct drm_magic_entry {
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drm_magic_t magic;
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drm_hash_item_t hash_item;
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struct list_head head;
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struct drm_file *priv;
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struct drm_magic_entry *next;
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} drm_magic_entry_t;
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@ -653,7 +654,8 @@ typedef struct drm_device {
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/*@{ */
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drm_file_t *file_first; /**< file list head */
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drm_file_t *file_last; /**< file list tail */
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drm_magic_head_t magiclist[DRM_HASH_SIZE]; /**< magic hash table */
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drm_open_hash_t magiclist; /**< magic hash table */
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struct list_head magicfree;
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/*@} */
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/** \name Memory management */
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@ -35,20 +35,6 @@
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#include "drmP.h"
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/**
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* Generate a hash key from a magic.
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*
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* \param magic magic.
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* \return hash key.
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*
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* The key is the modulus of the hash table size, #DRM_HASH_SIZE, which must be
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* a power of 2.
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*/
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static int drm_hash_magic(drm_magic_t magic)
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{
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return magic & (DRM_HASH_SIZE - 1);
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}
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/**
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* Find the file with the given magic number.
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*
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@ -63,14 +49,12 @@ static drm_file_t *drm_find_file(drm_device_t * dev, drm_magic_t magic)
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{
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drm_file_t *retval = NULL;
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drm_magic_entry_t *pt;
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int hash = drm_hash_magic(magic);
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drm_hash_item_t *hash;
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mutex_lock(&dev->struct_mutex);
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for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
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if (pt->magic == magic) {
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if (!drm_ht_find_item(&dev->magiclist, (unsigned long)magic, &hash)) {
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pt = drm_hash_entry(hash, drm_magic_entry_t, hash_item);
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retval = pt->priv;
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break;
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}
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}
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mutex_unlock(&dev->struct_mutex);
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return retval;
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@ -90,28 +74,20 @@ static drm_file_t *drm_find_file(drm_device_t * dev, drm_magic_t magic)
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static int drm_add_magic(drm_device_t * dev, drm_file_t * priv,
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drm_magic_t magic)
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{
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int hash;
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drm_magic_entry_t *entry;
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DRM_DEBUG("%d\n", magic);
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hash = drm_hash_magic(magic);
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entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC);
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if (!entry)
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return -ENOMEM;
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memset(entry, 0, sizeof(*entry));
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entry->magic = magic;
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entry->priv = priv;
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entry->next = NULL;
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entry->hash_item.key = (unsigned long)magic;
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mutex_lock(&dev->struct_mutex);
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if (dev->magiclist[hash].tail) {
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dev->magiclist[hash].tail->next = entry;
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dev->magiclist[hash].tail = entry;
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} else {
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dev->magiclist[hash].head = entry;
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dev->magiclist[hash].tail = entry;
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}
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drm_ht_insert_item(&dev->magiclist, &entry->hash_item);
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list_add_tail(&entry->head, &dev->magicfree);
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mutex_unlock(&dev->struct_mutex);
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return 0;
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@ -128,29 +104,19 @@ static int drm_add_magic(drm_device_t * dev, drm_file_t * priv,
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*/
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static int drm_remove_magic(drm_device_t * dev, drm_magic_t magic)
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{
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drm_magic_entry_t *prev = NULL;
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drm_magic_entry_t *pt;
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int hash;
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drm_hash_item_t *hash;
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DRM_DEBUG("%d\n", magic);
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hash = drm_hash_magic(magic);
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mutex_lock(&dev->struct_mutex);
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for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
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if (pt->magic == magic) {
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if (dev->magiclist[hash].head == pt) {
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dev->magiclist[hash].head = pt->next;
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}
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if (dev->magiclist[hash].tail == pt) {
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dev->magiclist[hash].tail = prev;
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}
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if (prev) {
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prev->next = pt->next;
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}
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if (drm_ht_find_item(&dev->magiclist, (unsigned long)magic, &hash)) {
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mutex_unlock(&dev->struct_mutex);
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return 0;
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}
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return -EINVAL;
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}
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pt = drm_hash_entry(hash, drm_magic_entry_t, hash_item);
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drm_ht_remove_item(&dev->magiclist, hash);
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list_del(&pt->head);
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mutex_unlock(&dev->struct_mutex);
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drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
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@ -155,13 +155,11 @@ int drm_lastclose(drm_device_t * dev)
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del_timer(&dev->timer);
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/* Clear pid list */
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for (i = 0; i < DRM_HASH_SIZE; i++) {
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for (pt = dev->magiclist[i].head; pt; pt = next) {
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next = pt->next;
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list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
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list_del(&pt->head);
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drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
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drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
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}
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dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
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}
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/* Clear AGP information */
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if (drm_core_has_AGP(dev) && dev->agp) {
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@ -72,10 +72,8 @@ static int drm_setup(drm_device_t * dev)
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for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
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atomic_set(&dev->counts[i], 0);
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for (i = 0; i < DRM_HASH_SIZE; i++) {
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dev->magiclist[i].head = NULL;
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dev->magiclist[i].tail = NULL;
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}
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drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER);
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INIT_LIST_HEAD(&dev->magicfree);
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dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist), DRM_MEM_CTXLIST);
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if (dev->ctxlist == NULL)
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@ -35,7 +35,7 @@
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#ifndef DRM_HASHTAB_H
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#define DRM_HASHTAB_H
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#define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
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#define drm_hash_entry(_ptr, _type, _member) list_entry(_ptr, _type, _member)
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typedef struct drm_hash_item{
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struct hlist_node head;
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