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drm/arm/malidp: fix a possible null pointer dereference
[ Upstream commita1f95aede6
] In malidp_mw_connector_reset, new memory is allocated with kzalloc, but no check is performed. In order to prevent null pointer dereferencing, ensure that mw_state is checked before calling __drm_atomic_helper_connector_reset. Fixes:8cbc5caf36
("drm: mali-dp: Add writeback connector") Signed-off-by: Huai-Yuan Liu <qq810974084@gmail.com> Signed-off-by: Liviu Dudau <liviu.dudau@arm.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240407063053.5481-1-qq810974084@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 4 additions and 1 deletions
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@ -69,7 +69,10 @@ static void malidp_mw_connector_reset(struct drm_connector *connector)
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__drm_atomic_helper_connector_destroy_state(connector->state);
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kfree(connector->state);
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__drm_atomic_helper_connector_reset(connector, &mw_state->base);
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connector->state = NULL;
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if (mw_state)
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__drm_atomic_helper_connector_reset(connector, &mw_state->base);
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}
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static enum drm_connector_status
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