This is a note to let you know that I've just added the patch titled firmware: Fix a reference count leak. to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: firmware-fix-a-reference-count-leak.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit fb80a10a18384c444def22ceee8264d080697afb Author: Qiushi Wu <wu000273@xxxxxxx> Date: Sat Jun 13 14:05:33 2020 -0500 firmware: Fix a reference count leak. [ Upstream commit fe3c60684377d5ad9b0569b87ed3e26e12c8173b ] 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. Callback function fw_cfg_sysfs_release_entry() in kobject_put() can handle the pointer "entry" properly. Signed-off-by: Qiushi Wu <wu000273@xxxxxxx> Link: https://lore.kernel.org/r/20200613190533.15712-1-wu000273@xxxxxxx Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c index 039e0f91dba8f..6945c3c966375 100644 --- a/drivers/firmware/qemu_fw_cfg.c +++ b/drivers/firmware/qemu_fw_cfg.c @@ -605,8 +605,10 @@ static int fw_cfg_register_file(const struct fw_cfg_file *f) /* register entry under "/sys/firmware/qemu_fw_cfg/by_key/" */ err = kobject_init_and_add(&entry->kobj, &fw_cfg_sysfs_entry_ktype, fw_cfg_sel_ko, "%d", entry->select); - if (err) - goto err_register; + if (err) { + kobject_put(&entry->kobj); + return err; + } /* add raw binary content access */ err = sysfs_create_bin_file(&entry->kobj, &fw_cfg_sysfs_attr_raw); @@ -622,7 +624,6 @@ static int fw_cfg_register_file(const struct fw_cfg_file *f) err_add_raw: kobject_del(&entry->kobj); -err_register: kfree(entry); return err; }