[PATCH 6.9 030/197] drm/amd/display: Check pipe offset before setting vblank

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6.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Hung <alex.hung@xxxxxxx>

[ Upstream commit 5396a70e8cf462ec5ccf2dc8de103c79de9489e6 ]

pipe_ctx has a size of MAX_PIPES so checking its index before accessing
the array.

This fixes an OVERRUN issue reported by Coverity.

Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@xxxxxxx>
Acked-by: Wayne Lin <wayne.lin@xxxxxxx>
Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 .../drm/amd/display/dc/irq/dce110/irq_service_dce110.c    | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/irq/dce110/irq_service_dce110.c b/drivers/gpu/drm/amd/display/dc/irq/dce110/irq_service_dce110.c
index 1c0d89e675da5..bb576a9c5fdbd 100644
--- a/drivers/gpu/drm/amd/display/dc/irq/dce110/irq_service_dce110.c
+++ b/drivers/gpu/drm/amd/display/dc/irq/dce110/irq_service_dce110.c
@@ -211,8 +211,12 @@ bool dce110_vblank_set(struct irq_service *irq_service,
 						   info->ext_id);
 	uint8_t pipe_offset = dal_irq_src - IRQ_TYPE_VBLANK;
 
-	struct timing_generator *tg =
-			dc->current_state->res_ctx.pipe_ctx[pipe_offset].stream_res.tg;
+	struct timing_generator *tg;
+
+	if (pipe_offset >= MAX_PIPES)
+		return false;
+
+	tg = dc->current_state->res_ctx.pipe_ctx[pipe_offset].stream_res.tg;
 
 	if (enable) {
 		if (!tg || !tg->funcs->arm_vert_intr(tg, 2)) {
-- 
2.43.0







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