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firmware_loader: Fix use-after-free during unregister

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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().

Fixes: 97730bbb24 ("firmware_loader: Add firmware-upload support")
Cc: stable <stable@kernel.org>
Reported-by: kernel test robot <oliver.sang@intel.com>
Reviewed-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Link: https://lore.kernel.org/r/20220829174557.437047-1-russell.h.weight@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Russ Weight 2022-08-29 10:45:57 -07:00 committed by Greg Kroah-Hartman
parent 9b03e79300
commit 8b40c38e37
1 changed files with 2 additions and 1 deletions
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3
drivers/base/firmware_loader/sysfs_upload.c
View file

@ -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);