efi/esrt: Fix reference count leak in esre_create_sysfs_entry.

BugLink: https://bugs.launchpad.net/bugs/1885942
[ Upstream commit 4ddf4739be6e375116c375f0a68bf3893ffcee21 ]

kobject_init_and_add() takes reference even when it fails.
If this function returns an error, kobject_put() must be called to
properly clean up the memory associated with the object. Previous
commit "b8eb718348b8" fixed a similar problem.

Fixes: 0bb549052d33 ("efi: Add esrt support")
Signed-off-by: Qiushi Wu <wu000273@umn.edu>
Link: https://lore.kernel.org/r/20200528183804.4497-1-wu000273@umn.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

diff --git a/drivers/firmware/efi/esrt.c b/drivers/firmware/efi/esrt.c
index d6dd5f503fa2366f3a7565db7142a5ba6d28e945..e8f71a50ba8961ab3da0cb7efecb85376dad2893 100644 (file)
--- a/drivers/firmware/efi/esrt.c
+++ b/drivers/firmware/efi/esrt.c
@@ -181,7 +181,7 @@ static int esre_create_sysfs_entry(void *esre, int entry_num)
                rc = kobject_init_and_add(&entry->kobj, &esre1_ktype, NULL,
                                          "entry%d", entry_num);
                if (rc) {
-                       kfree(entry);
+                       kobject_put(&entry->kobj);
                        return rc;
                }
        }