firmware: Fix an oops on reading fw_priv->fw in sysfs loading file

This oops was reported recently:
firmware_loading_store+0xf9/0x17b
dev_attr_store+0x20/0x22
sysfs_write_file+0x101/0x134
vfs_write+0xac/0xf3
sys_write+0x4a/0x6e
system_call_fastpath+0x16/0x1b

The complete backtrace was unfortunately not captured, but details can be found
here:
https://bugzilla.redhat.com/show_bug.cgi?id=769920

The cause is fairly clear.

Its caused by the fact that firmware_loading_store has a case 0 in its
switch statement that reads and writes the fw_priv->fw poniter without the
protection of the fw_lock mutex.  since there is a window between the time that
_request_firmware sets fw_priv->fw to NULL and the time the corresponding sysfs
file is unregistered, its possible for a user space application to race in, and
write a zero to the loading file, causing a NULL dereference in
firmware_loading_store.  Fix it by extending the protection of the fw_lock mutex
to cover all of the firware_loading_store function.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 06ed6b4..3719c94 100644 (file)
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -226,13 +226,13 @@ static ssize_t firmware_loading_store(struct device *dev,
        int loading = simple_strtol(buf, NULL, 10);
        int i;
 
+       mutex_lock(&fw_lock);
+
+       if (!fw_priv->fw)
+               goto out;
+
        switch (loading) {
        case 1:
-               mutex_lock(&fw_lock);
-               if (!fw_priv->fw) {
-                       mutex_unlock(&fw_lock);
-                       break;
-               }
                firmware_free_data(fw_priv->fw);
                memset(fw_priv->fw, 0, sizeof(struct firmware));
                /* If the pages are not owned by 'struct firmware' */
@@ -243,7 +243,6 @@ static ssize_t firmware_loading_store(struct device *dev,
                fw_priv->page_array_size = 0;
                fw_priv->nr_pages = 0;
                set_bit(FW_STATUS_LOADING, &fw_priv->status);
-               mutex_unlock(&fw_lock);
                break;
        case 0:
                if (test_bit(FW_STATUS_LOADING, &fw_priv->status)) {
@@ -274,7 +273,8 @@ static ssize_t firmware_loading_store(struct device *dev,
                fw_load_abort(fw_priv);
                break;
        }
-
+out:
+       mutex_unlock(&fw_lock);
        return count;
 }