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Fix firmware loader uevent buffer NULL pointer dereference 

The firmware class uevent function accessed the "fw_priv->buf" buffer
without the proper locking and testing for NULL.  This is an old bug
(looks like it goes back to 2012 and commit 1244691c73b2: "firmware
loader: introduce firmware_buf"), but for some reason it's triggering
only now in 4.2-rc1.

Shuah Khan is trying to bisect what it is that causes this to trigger
more easily, but in the meantime let's just fix the bug since others are
hitting it too (at least Ingo reports having seen it as well).

Reported-and-tested-by: Shuah Khan <shuahkh@osg.samsung.com>
Acked-by: Ming Lei <ming.lei@canonical.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2015-07-09 11:20:01 -07:00
parent 6b7339f4c3
commit 6f957724b9
1 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/base/firmware_class.c
View File

@ -563,10 +563,8 @@ static void fw_dev_release(struct device *dev)
kfree(fw_priv);
}
static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env)
static int do_firmware_uevent(struct firmware_priv *fw_priv, struct kobj_uevent_env *env)
{
struct firmware_priv *fw_priv = to_firmware_priv(dev);
if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->buf->fw_id))
return -ENOMEM;
if (add_uevent_var(env, "TIMEOUT=%i", loading_timeout))
@ -577,6 +575,18 @@ static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env)
return 0;
}
static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct firmware_priv *fw_priv = to_firmware_priv(dev);
int err = 0;
mutex_lock(&fw_lock);
if (fw_priv->buf)
err = do_firmware_uevent(fw_priv, env);
mutex_unlock(&fw_lock);
return err;
}
static struct class firmware_class = {
.name = "firmware",
.class_attrs = firmware_class_attrs,