6.1-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Weißschuh linux@weissschuh.net
[ 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@weissschuh.net Signed-off-by: Helge Deller deller@gmx.de Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Xiangyu Chen xiangyu.chen@windriver.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 16c1aaae9afa4..53944bcc990c5 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,