lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 29 Aug 2022 10:45:57 -0700 From: Russ Weight <russell.h.weight@...el.com> To: mcgrof@...nel.org, gregkh@...uxfoundation.org, rafael@...nel.org, linux-kernel@...r.kernel.org Cc: trix@...hat.com, lgoncalv@...hat.com, matthew.gerlach@...ux.intel.com, basheer.ahmed.muddebihal@...el.com, tianfei.zhang@...el.com, Russ Weight <russell.h.weight@...el.com>, kernel test robot <oliver.sang@...el.com> Subject: [PATCH v2 1/1] firmware_loader: Fix use-after-free during unregister In the following code within firmware_upload_unregister(), the call to device_unregister() could result in the dev_release function freeing the fw_upload_priv structure before it is dereferenced for the call to module_put(). This bug was found by the kernel test robot using CONFIG_KASAN while running the firmware selftests. device_unregister(&fw_sysfs->dev); module_put(fw_upload_priv->module); The problem is fixed by copying fw_upload_priv->module to a local variable for use when calling device_unregister(). Reported-by: kernel test robot <oliver.sang@...el.com> Fixes: 97730bbb242c ("firmware_loader: Add firmware-upload support") Signed-off-by: Russ Weight <russell.h.weight@...el.com> --- v2: Rebased to latest linux-next branch (next-20220829) --- drivers/base/firmware_loader/sysfs_upload.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/base/firmware_loader/sysfs_upload.c b/drivers/base/firmware_loader/sysfs_upload.c index 87044d52322a..63e15bddd80c 100644 --- a/drivers/base/firmware_loader/sysfs_upload.c +++ b/drivers/base/firmware_loader/sysfs_upload.c @@ -377,6 +377,7 @@ void firmware_upload_unregister(struct fw_upload *fw_upload) { struct fw_sysfs *fw_sysfs = fw_upload->priv; struct fw_upload_priv *fw_upload_priv = fw_sysfs->fw_upload_priv; + struct module *module = fw_upload_priv->module; mutex_lock(&fw_upload_priv->lock); if (fw_upload_priv->progress == FW_UPLOAD_PROG_IDLE) { @@ -392,6 +393,6 @@ void firmware_upload_unregister(struct fw_upload *fw_upload) unregister: device_unregister(&fw_sysfs->dev); - module_put(fw_upload_priv->module); + module_put(module); } EXPORT_SYMBOL_GPL(firmware_upload_unregister); -- 2.25.1
Powered by blists - more mailing lists