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drm/vc4: tests: Fix UAF in the mock helpers

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[ Upstream commit cdcd6aef9db5797995d4153ea19fdf56d189f0e4 ]

The VC4 mock helpers allocate the CRTC, encoders and connectors using a
call to kunit_kzalloc(), but the DRM device they are attache to survives
for longer than the test itself which leads to use-after-frees reported
by KASAN.

Switch to drmm_kzalloc to tie the lifetime of these objects to the main
DRM device.

Fixes: f759f5b53f1c ("drm/vc4: tests: Introduce a mocking infrastructure")
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Closes: https://lore.kernel.org/all/CA+G9fYvJA2HGqzR9LGgq63v0SKaUejHAE6f7+z9cwWN-ourJ_g@mail.gmail.com/
Tested-by: Anders Roxell <anders.roxell@linaro.org>
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231024105640.352752-1-mripard@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxime Ripard 2023-10-24 12:56:40 +02:00 committed by Greg Kroah-Hartman
parent 4bc46c047e
commit e733f3e9dc
2 changed files with 2 additions and 2 deletions
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2
drivers/gpu/drm/vc4/tests/vc4_mock_crtc.c
View File

@ -26,7 +26,7 @@ struct vc4_dummy_crtc *vc4_mock_pv(struct kunit *test,
struct vc4_crtc *vc4_crtc;
int ret;
dummy_crtc = kunit_kzalloc(test, sizeof(*dummy_crtc), GFP_KERNEL);
dummy_crtc = drmm_kzalloc(drm, sizeof(*dummy_crtc), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, dummy_crtc);
vc4_crtc = &dummy_crtc->crtc;

2
drivers/gpu/drm/vc4/tests/vc4_mock_output.c
View File

@ -32,7 +32,7 @@ struct vc4_dummy_output *vc4_dummy_output(struct kunit *test,
struct drm_encoder *enc;
int ret;
dummy_output = kunit_kzalloc(test, sizeof(*dummy_output), GFP_KERNEL);
dummy_output = drmm_kzalloc(drm, sizeof(*dummy_output), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dummy_output);
dummy_output->encoder.type = vc4_encoder_type;