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

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[ Upstream commit 935a92a1c400285545198ca2800a4c6c519c650a ]

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: fb43aa0acdfd ("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>
This commit is contained in:
Aleksandr Mishin 2024-04-08 15:58:10 +03:00 • committed by Ksawlii
parent 8a93e85d7c
commit 3fdd8f3a94
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
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@ -1978,6 +1978,9 @@ static void cdns_mhdp_atomic_enable(struct drm_bridge *bridge,
mhdp_state = to_cdns_mhdp_bridge_state(new_state);
mhdp_state->current_mode = drm_mode_duplicate(bridge->dev, mode);
if (!mhdp_state->current_mode)
return;
drm_mode_set_name(mhdp_state->current_mode);
dev_dbg(mhdp->dev, "%s: Enabling mode %s\n", __func__, mode->name);