From: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Date: Thu, 17 Oct 2024 02:04:38 +0000 (+0530)
Subject: drm/amd/display: Add hpd_source index check for dcn10 link encoder setup
X-Git-Tag: v6.13-rc1~122^2~15^2~42
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a3fc44b98043df7a843e43eb217bc937f3d7a9d8;p=thirdparty%2Fkernel%2Flinux.git

drm/amd/display: Add hpd_source index check for dcn10 link encoder setup

This patch adds a boundary check for the hpd_source index during the
link encoder creation process for all dcn10 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/dcn10/dcn10_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn10/dcn10_resource.c
index 563c5eec83ff3..05d6d41ef9d31 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn10/dcn10_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn10/dcn10_resource.c
@@ -751,7 +751,7 @@ static struct link_encoder *dcn10_link_encoder_create(
 		kzalloc(sizeof(struct dcn10_link_encoder), GFP_KERNEL);
 	int link_regs_id;
 
-	if (!enc10)
+	if (!enc10 || enc_init_data->hpd_source >= ARRAY_SIZE(link_enc_hpd_regs))
 		return NULL;
 
 	link_regs_id =