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drm/arm/malidp: fix a possible null pointer dereference

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[ Upstream commit a1f95aede6285dba6dd036d907196f35ae3a11ea ]

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: 8cbc5caf36ef ("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>
This commit is contained in:
Huai-Yuan Liu 2024-04-07 14:30:53 +08:00 committed by Greg Kroah-Hartman
parent 82c2c85aea
commit 3e54d4e951
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/arm/malidp_mw.c
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@ -70,7 +70,10 @@ static void malidp_mw_connector_reset(struct drm_connector *connector)
__drm_atomic_helper_connector_destroy_state(connector->state);
kfree(connector->state);
__drm_atomic_helper_connector_reset(connector, &mw_state->base);
connector->state = NULL;
if (mw_state)
__drm_atomic_helper_connector_reset(connector, &mw_state->base);
}
static enum drm_connector_status