linux-kernel - kmemleak reports firmware loader funnies in iwlwifi

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Message-ID: <20090626171933.GA23170@redhat.com>
Date:	Fri, 26 Jun 2009 13:19:33 -0400
From:	Dave Jones <davej@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Catalin Marinas <catalin.marinas@....com>, netdev@...r.kernel.org
Subject: kmemleak reports firmware loader funnies in iwlwifi

After enabling kmemleak in the Fedora rawhide kernels, we've mostly
seen a flood of what appear to be false positives, but the below looks
really suspect..

https://bugzilla.redhat.com/show_bug.cgi?id=507971

Here's the summary... 

iwlagn 0000:03:00.0: loaded firmware version 8.24.2.12
kmemleak: Freeing unknown object at 0xffffc90018070000
Pid: 1034, comm: NetworkManager Not tainted 2.6.31-0.25.rc0.git22.fc12.x86_64
#1
Call Trace:
 [<ffffffff81139f74>] delete_object+0x5b/0x13b
 [<ffffffff8113b012>] kmemleak_free+0x5b/0xb5
 [<ffffffff8111dc51>] vfree+0x40/0x68
 [<ffffffff813485e6>] release_firmware+0x49/0x6c
 [<ffffffffa021997c>] ? iwl_mac_start+0xc5c/0x106b [iwlagn]
 [<ffffffffa0219adc>] iwl_mac_start+0xdbc/0x106b [iwlagn]
 [<ffffffff8109df9b>] ? __module_text_address+0x25/0x85

So it appears to be vfree'ing something that it had no knowledge of ever allocating.
afaict _request_firmware only vmallocs when it's using a firmware image built into
the driver, which isn't the case here, so I'm not sure why we end up trying
to vfree instead of kfree when we call release_firmware

anyone know what's going on here?

	Dave
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