From: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Date: Thu, 17 Oct 2024 02:06:46 +0000 (+0530)
Subject: drm/amd/display: Add hpd_source index check for dcn401 link encoder setup
X-Git-Tag: microblaze-v6.16~490^2~20^2~41
X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=86b5be6ea20a9c8f4b23bf4377be48e5d7facfcb;p=linux-2.6-microblaze.git

drm/amd/display: Add hpd_source index check for dcn401 link encoder setup

This patch adds a boundary check for the hpd_source index during the
link encoder creation process for all dcn401 ip. 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 <chiahsuan.chung@amd.com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Cc: Roman Li <roman.li@amd.com>
Cc: Alex Hung <alex.hung@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Roman Li <roman.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c
index 46feff9348d9..b425b34dc7f5 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c
@@ -1032,7 +1032,7 @@ static struct link_encoder *dcn401_link_encoder_create(
 	struct dcn20_link_encoder *enc20 =
 		kzalloc(sizeof(struct dcn20_link_encoder), GFP_KERNEL);
 
-	if (!enc20)
+	if (!enc20 || enc_init_data->hpd_source >= ARRAY_SIZE(link_enc_hpd_regs))
 		return NULL;
 
 #undef REG_STRUCT