linux-kernel - Re: [PATCH v2 2/4] drm/connector: hdmi: Fix memory leak in drm_display_mode_from_cea

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241016-functional-funky-boar-0ccadc@houat>
Date: Wed, 16 Oct 2024 11:36:54 +0200
From: mripard@...nel.org
To: Jinjie Ruan <ruanjinjie@...wei.com>
Cc: maarten.lankhorst@...ux.intel.com, tzimmermann@...e.de, 
	airlied@...il.com, simona@...ll.ch, christian.koenig@....com, ray.huang@....com, 
	dmitry.baryshkov@...aro.org, dave.stevenson@...pberrypi.com, mcanal@...lia.com, 
	quic_jjohnson@...cinc.com, skhan@...uxfoundation.org, davidgow@...gle.com, 
	karolina.stolarek@...el.com, Arunpravin.PaneerSelvam@....com, 
	thomas.hellstrom@...ux.intel.com, asomalap@....com, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] drm/connector: hdmi: Fix memory leak in
 drm_display_mode_from_cea_vic()

On Mon, Oct 14, 2024 at 08:52:02PM GMT, Jinjie Ruan wrote:
> modprobe drm_connector_test and then rmmod drm_connector_test,
> the following memory leak occurs.
> 
> The `mode` allocated in drm_mode_duplicate() called by
> drm_display_mode_from_cea_vic() is not freed, which cause the memory leak:
> 
> 	unreferenced object 0xffffff80cb0ee400 (size 128):
> 	  comm "kunit_try_catch", pid 1948, jiffies 4294950339
> 	  hex dump (first 32 bytes):
> 	    14 44 02 00 80 07 d8 07 04 08 98 08 00 00 38 04  .D............8.
> 	    3c 04 41 04 65 04 00 00 05 00 00 00 00 00 00 00  <.A.e...........
> 	  backtrace (crc 90e9585c):
> 	    [<00000000ec42e3d7>] kmemleak_alloc+0x34/0x40
> 	    [<00000000d0ef055a>] __kmalloc_cache_noprof+0x26c/0x2f4
> 	    [<00000000c2062161>] drm_mode_duplicate+0x44/0x19c
> 	    [<00000000f96c74aa>] drm_display_mode_from_cea_vic+0x88/0x98
> 	    [<00000000d8f2c8b4>] 0xffffffdc982a4868
> 	    [<000000005d164dbc>] kunit_try_run_case+0x13c/0x3ac
> 	    [<000000006fb23398>] kunit_generic_run_threadfn_adapter+0x80/0xec
> 	    [<000000006ea56ca0>] kthread+0x2e8/0x374
> 	    [<000000000676063f>] ret_from_fork+0x10/0x20
> 	......
> 
> Free `mode` by using drm_kunit_helper_display_mode_from_cea_vic()
> to fix it.
> 
> Cc: stable@...r.kernel.org
> Fixes: abb6f74973e2 ("drm/tests: Add HDMI TDMS character rate tests")
> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>

Acked-by: Maxime Ripard <mripard@...nel.org>

Maxime

Download attachment "signature.asc" of type "application/pgp-signature" (274 bytes)