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drm/amd/display: Handle dml allocation failure to avoid crash

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[Why]
In the case where a dml allocation fails for any reason, the
current state's dml contexts would no longer be valid. Then
subsequent calls dc_state_copy_internal would shallow copy
invalid memory and if the new state was released, a double
free would occur.

[How]
Reset dml pointers in new_state to NULL and avoid invalid
pointer

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Ryan Seto <ryanseto@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit bcafdc61529a48f6f06355d78eb41b3aeda5296c)
Cc: stable@vger.kernel.org
This commit is contained in:
Ryan Seto 2024-11-01 10:19:56 -04:00 committed by Alex Deucher
parent bd8a957661
commit 6825cb07b7
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/dc/core/dc_state.c
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@ -265,6 +265,9 @@ struct dc_state *dc_state_create_copy(struct dc_state *src_state)
dc_state_copy_internal(new_state, src_state);
#ifdef CONFIG_DRM_AMD_DC_FP
new_state->bw_ctx.dml2 = NULL;
new_state->bw_ctx.dml2_dc_power_source = NULL;
if (src_state->bw_ctx.dml2 &&
!dml2_create_copy(&new_state->bw_ctx.dml2, src_state->bw_ctx.dml2)) {
dc_state_release(new_state);