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firmware: qemu_fw_cfg: fix kobject leak in probe error path
commit47a1db8e79
upstream. An initialised kobject must be freed using kobject_put() to avoid leaking associated resources (e.g. the object name). Commitfe3c606843
("firmware: Fix a reference count leak.") "fixed" the leak in the first error path of the file registration helper but left the second one unchanged. This "fix" would however result in a NULL pointer dereference due to the release function also removing the never added entry from the fw_cfg_entry_cache list. This has now been addressed. Fix the remaining kobject leak by restoring the common error path and adding the missing kobject_put(). Fixes:75f3e8e47f
("firmware: introduce sysfs driver for QEMU's fw_cfg device") Cc: stable@vger.kernel.org # 4.6 Cc: Gabriel Somlo <somlo@cmu.edu> Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20211201132528.30025-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
1cc36ed561
commit
5c69ba9e80
1 changed files with 6 additions and 7 deletions
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@ -600,15 +600,13 @@ static int fw_cfg_register_file(const struct fw_cfg_file *f)
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/* register entry under "/sys/firmware/qemu_fw_cfg/by_key/" */
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err = kobject_init_and_add(&entry->kobj, &fw_cfg_sysfs_entry_ktype,
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fw_cfg_sel_ko, "%d", entry->select);
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if (err) {
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kobject_put(&entry->kobj);
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return err;
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}
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if (err)
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goto err_put_entry;
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/* add raw binary content access */
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err = sysfs_create_bin_file(&entry->kobj, &fw_cfg_sysfs_attr_raw);
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if (err)
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goto err_add_raw;
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goto err_del_entry;
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/* try adding "/sys/firmware/qemu_fw_cfg/by_name/" symlink */
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fw_cfg_build_symlink(fw_cfg_fname_kset, &entry->kobj, entry->name);
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@ -617,9 +615,10 @@ static int fw_cfg_register_file(const struct fw_cfg_file *f)
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fw_cfg_sysfs_cache_enlist(entry);
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return 0;
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err_add_raw:
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err_del_entry:
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kobject_del(&entry->kobj);
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kfree(entry);
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err_put_entry:
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kobject_put(&entry->kobj);
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return err;
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}
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