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Driver core fixes for 5.9-rc5

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Here are some small driver core and debugfs fixes for 5.9-rc5
 
 Included in here are:
 	- firmware loader memory leak fix
 	- firmware loader testing fixes for non-EFI systems
 	- device link locking fixes found by lockdep
 	- kobject_del() bugfix that has been affecting some callers
 	- debugfs minor fix
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg KH:
 "Here are some small driver core and debugfs fixes for 5.9-rc5

  Included in here are:

   - firmware loader memory leak fix

   - firmware loader testing fixes for non-EFI systems

   - device link locking fixes found by lockdep

   - kobject_del() bugfix that has been affecting some callers

   - debugfs minor fix

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'driver-core-5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  test_firmware: Test platform fw loading on non-EFI systems
  PM: <linux/device.h>: fix @em_pd kernel-doc warning
  kobject: Drop unneeded conditional in __kobject_del()
  driver core: Fix device_pm_lock() locking for device links
  MAINTAINERS: Add the security document to SECURITY CONTACT
  driver code: print symbolic error code
  debugfs: Fix module state check condition
  kobject: Restore old behaviour of kobject_del(NULL)
  firmware_loader: fix memory leak for paged buffer
This commit is contained in:
Linus Torvalds 2020-09-13 09:02:59 -07:00
commit 20a7b6be05
9 changed files with 39 additions and 27 deletions
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1
MAINTAINERS
View file

@ -15577,6 +15577,7 @@ F: include/uapi/linux/sed*
SECURITY CONTACT
M: Security Officers <security@kernel.org>
S: Supported
F: Documentation/admin-guide/security-bugs.rst
SECURITY SUBSYSTEM
M: James Morris <jmorris@namei.org>

8
drivers/base/core.c
View file

@ -807,9 +807,7 @@ static void device_link_put_kref(struct device_link *link)
void device_link_del(struct device_link *link)
{
device_links_write_lock();
device_pm_lock();
device_link_put_kref(link);
device_pm_unlock();
device_links_write_unlock();
}
EXPORT_SYMBOL_GPL(device_link_del);
@ -830,7 +828,6 @@ void device_link_remove(void *consumer, struct device *supplier)
return;
device_links_write_lock();
device_pm_lock();
list_for_each_entry(link, &supplier->links.consumers, s_node) {
if (link->consumer == consumer) {
@ -839,7 +836,6 @@ void device_link_remove(void *consumer, struct device *supplier)
}
}
device_pm_unlock();
device_links_write_unlock();
}
EXPORT_SYMBOL_GPL(device_link_remove);
@ -4237,10 +4233,10 @@ int dev_err_probe(const struct device *dev, int err, const char *fmt, ...)
vaf.va = &args;
if (err != -EPROBE_DEFER) {
dev_err(dev, "error %d: %pV", err, &vaf);
dev_err(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
} else {
device_set_deferred_probe_reason(dev, &vaf);
dev_dbg(dev, "error %d: %pV", err, &vaf);
dev_dbg(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
}
va_end(args);

2
drivers/base/firmware_loader/firmware.h
View file

@ -142,10 +142,12 @@ int assign_fw(struct firmware *fw, struct device *device, u32 opt_flags);
void fw_free_paged_buf(struct fw_priv *fw_priv);
int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed);
int fw_map_paged_buf(struct fw_priv *fw_priv);
bool fw_is_paged_buf(struct fw_priv *fw_priv);
#else
static inline void fw_free_paged_buf(struct fw_priv *fw_priv) {}
static inline int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed) { return -ENXIO; }
static inline int fw_map_paged_buf(struct fw_priv *fw_priv) { return -ENXIO; }
static inline bool fw_is_paged_buf(struct fw_priv *fw_priv) { return false; }
#endif
#endif /* __FIRMWARE_LOADER_H */

17
drivers/base/firmware_loader/main.c
View file

@ -252,9 +252,11 @@ static void __free_fw_priv(struct kref *ref)
list_del(&fw_priv->list);
spin_unlock(&fwc->lock);
fw_free_paged_buf(fw_priv); /* free leftover pages */
if (!fw_priv->allocated_size)
if (fw_is_paged_buf(fw_priv))
fw_free_paged_buf(fw_priv);
else if (!fw_priv->allocated_size)
vfree(fw_priv->data);
kfree_const(fw_priv->fw_name);
kfree(fw_priv);
}
@ -268,6 +270,11 @@ static void free_fw_priv(struct fw_priv *fw_priv)
}
#ifdef CONFIG_FW_LOADER_PAGED_BUF
bool fw_is_paged_buf(struct fw_priv *fw_priv)
{
return fw_priv->is_paged_buf;
}
void fw_free_paged_buf(struct fw_priv *fw_priv)
{
int i;
@ -275,6 +282,8 @@ void fw_free_paged_buf(struct fw_priv *fw_priv)
if (!fw_priv->pages)
return;
vunmap(fw_priv->data);
for (i = 0; i < fw_priv->nr_pages; i++)
__free_page(fw_priv->pages[i]);
kvfree(fw_priv->pages);
@ -328,10 +337,6 @@ int fw_map_paged_buf(struct fw_priv *fw_priv)
if (!fw_priv->data)
return -ENOMEM;
/* page table is no longer needed after mapping, let's free */
kvfree(fw_priv->pages);
fw_priv->pages = NULL;
return 0;
}
#endif

10
drivers/firmware/efi/embedded-firmware.c
View file

@ -16,9 +16,9 @@
/* Exported for use by lib/test_firmware.c only */
LIST_HEAD(efi_embedded_fw_list);
EXPORT_SYMBOL_GPL(efi_embedded_fw_list);
static bool checked_for_fw;
EXPORT_SYMBOL_NS_GPL(efi_embedded_fw_list, TEST_FIRMWARE);
bool efi_embedded_fw_checked;
EXPORT_SYMBOL_NS_GPL(efi_embedded_fw_checked, TEST_FIRMWARE);
static const struct dmi_system_id * const embedded_fw_table[] = {
#ifdef CONFIG_TOUCHSCREEN_DMI
@ -116,14 +116,14 @@ void __init efi_check_for_embedded_firmwares(void)
}
}
checked_for_fw = true;
efi_embedded_fw_checked = true;
}
int efi_get_embedded_fw(const char *name, const u8 **data, size_t *size)
{
struct efi_embedded_fw *iter, *fw = NULL;
if (!checked_for_fw) {
if (!efi_embedded_fw_checked) {
pr_warn("Warning %s called while we did not check for embedded fw\n",
__func__);
return -ENOENT;

4
fs/debugfs/file.c
View file

@ -177,7 +177,7 @@ static int open_proxy_open(struct inode *inode, struct file *filp)
goto out;
if (!fops_get(real_fops)) {
#ifdef MODULE
#ifdef CONFIG_MODULES
if (real_fops->owner &&
real_fops->owner->state == MODULE_STATE_GOING)
goto out;
@ -312,7 +312,7 @@ static int full_proxy_open(struct inode *inode, struct file *filp)
goto out;
if (!fops_get(real_fops)) {
#ifdef MODULE
#ifdef CONFIG_MODULES
if (real_fops->owner &&
real_fops->owner->state == MODULE_STATE_GOING)
goto out;

6
include/linux/efi_embedded_fw.h
View file

@ -8,8 +8,8 @@
#define EFI_EMBEDDED_FW_PREFIX_LEN 8
/*
* This struct and efi_embedded_fw_list are private to the efi-embedded fw
* implementation they are in this header for use by lib/test_firmware.c only!
* This struct is private to the efi-embedded fw implementation.
* They are in this header for use by lib/test_firmware.c only!
*/
struct efi_embedded_fw {
struct list_head list;
@ -18,8 +18,6 @@ struct efi_embedded_fw {
size_t length;
};
extern struct list_head efi_embedded_fw_list;
/**
* struct efi_embedded_fw_desc - This struct is used by the EFI embedded-fw
* code to search for embedded firmwares.

9
lib/kobject.c
View file

@ -604,9 +604,6 @@ static void __kobject_del(struct kobject *kobj)
struct kernfs_node *sd;
const struct kobj_type *ktype;
if (!kobj)
return;
sd = kobj->sd;
ktype = get_ktype(kobj);
@ -637,8 +634,12 @@ static void __kobject_del(struct kobject *kobj)
*/
void kobject_del(struct kobject *kobj)
{
struct kobject *parent = kobj->parent;
struct kobject *parent;
if (!kobj)
return;
parent = kobj->parent;
__kobject_del(kobj);
kobject_put(parent);
}

9
lib/test_firmware.c
View file

@ -26,6 +26,8 @@
#include <linux/vmalloc.h>
#include <linux/efi_embedded_fw.h>
MODULE_IMPORT_NS(TEST_FIRMWARE);
#define TEST_FIRMWARE_NAME "test-firmware.bin"
#define TEST_FIRMWARE_NUM_REQS 4
#define TEST_FIRMWARE_BUF_SIZE SZ_1K
@ -489,6 +491,9 @@ out:
static DEVICE_ATTR_WO(trigger_request);
#ifdef CONFIG_EFI_EMBEDDED_FIRMWARE
extern struct list_head efi_embedded_fw_list;
extern bool efi_embedded_fw_checked;
static ssize_t trigger_request_platform_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
@ -501,6 +506,7 @@ static ssize_t trigger_request_platform_store(struct device *dev,
};
struct efi_embedded_fw efi_embedded_fw;
const struct firmware *firmware = NULL;
bool saved_efi_embedded_fw_checked;
char *name;
int rc;
@ -513,6 +519,8 @@ static ssize_t trigger_request_platform_store(struct device *dev,
efi_embedded_fw.data = (void *)test_data;
efi_embedded_fw.length = sizeof(test_data);
list_add(&efi_embedded_fw.list, &efi_embedded_fw_list);
saved_efi_embedded_fw_checked = efi_embedded_fw_checked;
efi_embedded_fw_checked = true;
pr_info("loading '%s'\n", name);
rc = firmware_request_platform(&firmware, name, dev);
@ -530,6 +538,7 @@ static ssize_t trigger_request_platform_store(struct device *dev,
rc = count;
out:
efi_embedded_fw_checked = saved_efi_embedded_fw_checked;
release_firmware(firmware);
list_del(&efi_embedded_fw.list);
kfree(name);