drm: bridge: cdns-mhdp8546: Fix possible null pointer dereference

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[ Upstream commit 935a92a1c4 ]

In cdns_mhdp_atomic_enable(), the return value of drm_mode_duplicate() is
assigned to mhdp_state->current_mode, and there is a dereference of it in
drm_mode_set_name(), which will lead to a NULL pointer dereference on
failure of drm_mode_duplicate().

Fix this bug add a check of mhdp_state->current_mode.

Fixes: fb43aa0acd ("drm: bridge: Add support for Cadence MHDP8546 DPI/DP bridge")
Signed-off-by: Aleksandr Mishin <amishin@t-argos.ru>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240408125810.21899-1-amishin@t-argos.ru
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Aleksandr Mishin 2024-04-08 15:58:10 +03:00 • committed by Greg Kroah-Hartman

parent d33fbb62fb

commit ca53b7efd4

1 changed files with 3 additions and 0 deletions

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drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c

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