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Message-ID: <20241016-glistening-stalwart-horse-7e5b20@houat>
Date: Wed, 16 Oct 2024 11:37:49 +0200
From: Maxime Ripard <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 4/4] drm/tests: hdmi: Fix memory leaks in
drm_display_mode_from_cea_vic()
On Mon, Oct 14, 2024 at 08:52:04PM GMT, Jinjie Ruan wrote:
> modprobe drm_hdmi_state_helper_test and then rmmod it, 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 0xffffff80ccd18100 (size 128):
> comm "kunit_try_catch", pid 1851, jiffies 4295059695
> hex dump (first 32 bytes):
> 57 62 00 00 80 02 90 02 f0 02 20 03 00 00 e0 01 Wb........ .....
> ea 01 ec 01 0d 02 00 00 0a 00 00 00 00 00 00 00 ................
> backtrace (crc c2f1aa95):
> [<000000000f10b11b>] kmemleak_alloc+0x34/0x40
> [<000000001cd4cf73>] __kmalloc_cache_noprof+0x26c/0x2f4
> [<00000000f1f3cffa>] drm_mode_duplicate+0x44/0x19c
> [<000000008cbeef13>] drm_display_mode_from_cea_vic+0x88/0x98
> [<0000000019daaacf>] 0xffffffedc11ae69c
> [<000000000aad0f85>] kunit_try_run_case+0x13c/0x3ac
> [<00000000a9210bac>] kunit_generic_run_threadfn_adapter+0x80/0xec
> [<000000000a0b2e9e>] kthread+0x2e8/0x374
> [<00000000bd668858>] 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: 4af70f19e559 ("drm/tests: Add RGB Quantization tests")
> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
Acked-by: Maxime Ripard <mripard@...nel.org>
Maxime
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