From 1382901f75a5a7dc8eac05059fd0c7816def4eae Mon Sep 17 00:00:00 2001
From: Xia Fukun <xiafukun@huawei.com>
Date: Fri, 25 Nov 2022 14:34:28 +0800
Subject: drm/i915/bios: fix a memory leak in generate_lfp_data_ptrs
Git-commit: 1382901f75a5a7dc8eac05059fd0c7816def4eae
Patch-mainline: v6.2-rc1
References: git-fixes

When (size != 0 || ptrs->lvds_ entries != 3), the program tries to
free() the ptrs. However, the ptrs is not created by calling kzmalloc(),
but is obtained by pointer offset operation.
This may lead to memory leaks or undefined behavior.

Fix this by replacing the arguments of kfree() with ptrs_block.

Fixes: a87d0a847607 ("drm/i915/bios: Generate LFP data table pointers if the VBT lacks them")
Signed-off-by: Xia Fukun <xiafukun@huawei.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221125063428.69486-1-xiafukun@huawei.com
(cherry picked from commit 7674cd0b7d28b952151c3df26bbfa7e07eb2b4ec)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/i915/display/intel_bios.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index c2987f2c2b2e..572a4e3769f3 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -414,7 +414,7 @@ static void *generate_lfp_data_ptrs(struct drm_i915_private *i915,
 		ptrs->lvds_entries++;
 
 	if (size != 0 || ptrs->lvds_entries != 3) {
-		kfree(ptrs);
+		kfree(ptrs_block);
 		return NULL;
 	}
 
-- 
2.39.0