drm/amd/display: Add hpd_source index check for DCE60/80/100/110/112/120 link encoders

This patch adds a boundary check for the hpd_source index during the
link encoder creation process for all DCExxx IP's. The check ensures
that the index is within the valid range of the link_enc_hpd_regs array
to prevent out-of-bounds access.

Cc: Tom Chung <[e-mail]>
Cc: Rodrigo Siqueira <[e-mail]>
Cc: Roman Li <[e-mail]>
Cc: Alex Hung <[e-mail]>
Cc: Aurabindo Pillai <[e-mail]>
Cc: Harry Wentland <[e-mail]>
Cc: Hamza Mahfooz <[e-mail]>
Signed-off-by: Srinivasan Shanmugam <[e-mail]>
Reviewed-by: Roman Li <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/dce60/dce60_resource.c

···
 		kzalloc(sizeof(struct dce110_link_encoder), GFP_KERNEL);
 	int link_regs_id;
 
-	if (!enc110)
+	if (!enc110 || enc_init_data->hpd_source >= ARRAY_SIZE(link_enc_hpd_regs))
 		return NULL;
 
 	link_regs_id =

drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c

···
 		kzalloc(sizeof(struct dce110_link_encoder), GFP_KERNEL);
 	int link_regs_id;
 
-	if (!enc110)
+	if (!enc110 || enc_init_data->hpd_source >= ARRAY_SIZE(link_enc_hpd_regs))
 		return NULL;
 
 	link_regs_id =

drivers/gpu/drm/amd/display/dc/resource/dce110/dce110_resource.c

···
 		kzalloc(sizeof(struct dce110_link_encoder), GFP_KERNEL);
 	int link_regs_id;
 
-	if (!enc110)
+	if (!enc110 || enc_init_data->hpd_source >= ARRAY_SIZE(link_enc_hpd_regs))
 		return NULL;
 
 	link_regs_id =

drivers/gpu/drm/amd/display/dc/resource/dce112/dce112_resource.c

···
 		kzalloc(sizeof(struct dce110_link_encoder), GFP_KERNEL);
 	int link_regs_id;
 
-	if (!enc110)
+	if (!enc110 || enc_init_data->hpd_source >= ARRAY_SIZE(link_enc_hpd_regs))
 		return NULL;
 
 	link_regs_id =

drivers/gpu/drm/amd/display/dc/resource/dce120/dce120_resource.c

···
 		kzalloc(sizeof(struct dce110_link_encoder), GFP_KERNEL);
 	int link_regs_id;
 
-	if (!enc110)
+	if (!enc110 || enc_init_data->hpd_source >= ARRAY_SIZE(link_enc_hpd_regs))
 		return NULL;
 
 	link_regs_id =

drivers/gpu/drm/amd/display/dc/resource/dce80/dce80_resource.c

···
 		kzalloc(sizeof(struct dce110_link_encoder), GFP_KERNEL);
 	int link_regs_id;
 
-	if (!enc110)
+	if (!enc110 || enc_init_data->hpd_source >= ARRAY_SIZE(link_enc_hpd_regs))
 		return NULL;
 
 	link_regs_id =