From: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
[ Upstream commit 95cdd538e0e5677efbdf8aade04ec098ab98f457 ]
The driver core can register and cleanup sysfs groups already.
Make use of that functionality to simplify the error handling and
cleanup.
Also avoid a UAF race during unregistering where the sysctl attributes
were usable after the info struct was freed.
Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
Signed-off-by: Xiangyu Chen <xiangyu.chen@xxxxxxxxxxxxx>
---
drivers/video/fbdev/efifb.c | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)
diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
index 16c1aaae9afa..53944bcc990c 100644
--- a/drivers/video/fbdev/efifb.c
+++ b/drivers/video/fbdev/efifb.c
@@ -570,15 +570,10 @@ static int efifb_probe(struct platform_device *dev)
break;
}
- err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
- if (err) {
- pr_err("efifb: cannot add sysfs attrs\n");
- goto err_unmap;
- }
err = fb_alloc_cmap(&info->cmap, 256, 0);
if (err < 0) {
pr_err("efifb: cannot allocate colormap\n");
- goto err_groups;
+ goto err_unmap;
}
if (efifb_pci_dev)
@@ -597,8 +592,6 @@ static int efifb_probe(struct platform_device *dev)
pm_runtime_put(&efifb_pci_dev->dev);
fb_dealloc_cmap(&info->cmap);
-err_groups:
- sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
err_unmap:
if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
iounmap(info->screen_base);
@@ -618,7 +611,6 @@ static int efifb_remove(struct platform_device *pdev)
/* efifb_destroy takes care of info cleanup */
unregister_framebuffer(info);
- sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
return 0;
}
@@ -626,6 +618,7 @@ static int efifb_remove(struct platform_device *pdev)
static struct platform_driver efifb_driver = {
.driver = {
.name = "efi-framebuffer",
+ .dev_groups = efifb_groups,
},
.probe = efifb_probe,
.remove = efifb_remove,
--
2.43.0
