Driver core: change add_uevent_var to use a struct

This changes the uevent buffer functions to use a struct instead of a
long list of parameters. It does no longer require the caller to do the
proper buffer termination and size accounting, which is currently wrong
in some places. It fixes a known bug where parts of the uevent
environment are overwritten because of wrong index calculations.

Many thanks to Mathieu Desnoyers for finding bugs and improving the
error handling.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 8 insertions, 26 deletions

diff --git a/drivers/pci/hotplug.c b/drivers/pci/hotplug.c
index 1c97e7dd130b..2b5352a7dffc 100644
--- a/drivers/pci/hotplug.c
+++ b/drivers/pci/hotplug.c
@@ -3,12 +3,9 @@
 #include <linux/module.h>
 #include "pci.h"
 
-int pci_uevent(struct device *dev, char **envp, int num_envp,
-               char *buffer, int buffer_size)
+int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
         struct pci_dev *pdev;
-        int i = 0;
-        int length = 0;
 
         if (!dev)
                 return -ENODEV;
@@ -17,37 +14,24 @@ int pci_uevent(struct device *dev, char **envp, int num_envp,
         if (!pdev)
                 return -ENODEV;
 
-        if (add_uevent_var(envp, num_envp, &i,
-                           buffer, buffer_size, &length,
-                           "PCI_CLASS=%04X", pdev->class))
+        if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
                 return -ENOMEM;
 
-        if (add_uevent_var(envp, num_envp, &i,
-                           buffer, buffer_size, &length,
-                           "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
+        if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
                 return -ENOMEM;
 
-        if (add_uevent_var(envp, num_envp, &i,
-                           buffer, buffer_size, &length,
-                           "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
+        if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
                            pdev->subsystem_device))
                 return -ENOMEM;
 
-        if (add_uevent_var(envp, num_envp, &i,
-                           buffer, buffer_size, &length,
-                           "PCI_SLOT_NAME=%s", pci_name(pdev)))
+        if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
                 return -ENOMEM;
 
-        if (add_uevent_var(envp, num_envp, &i,
-                           buffer, buffer_size, &length,
-                           "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
+        if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
                            pdev->vendor, pdev->device,
                            pdev->subsystem_vendor, pdev->subsystem_device,
                            (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
                            (u8)(pdev->class)))
                 return -ENOMEM;
-
-        envp[i] = NULL;
-
         return 0;
 }
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 004bc2487270..f61be3abfdca 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -532,8 +532,7 @@ void pci_dev_put(struct pci_dev *dev)
 }
 
 #ifndef CONFIG_HOTPLUG
-int pci_uevent(struct device *dev, char **envp, int num_envp,
-               char *buffer, int buffer_size)
+int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
         return -ENODEV;
 }
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 4c36e80f6d26..b3a7d5b0f936 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -1,7 +1,6 @@
 /* Functions internal to the PCI core code */
 
-extern int pci_uevent(struct device *dev, char **envp, int num_envp,
-                      char *buffer, int buffer_size);
+extern int pci_uevent(struct device *dev, struct kobj_uevent_env *env);
 extern int pci_create_sysfs_dev_files(struct pci_dev *pdev);
 extern void pci_remove_sysfs_dev_files(struct pci_dev *pdev);
 extern void pci_cleanup_rom(struct pci_dev *dev);