linux-kernel - [PATCH] drm/i915/bios: fix a memory leak in generate_lfp_data

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Date:   Fri, 25 Nov 2022 14:34:28 +0800
From:   Xia Fukun <xiafukun@...wei.com>
To:     <jani.nikula@...ux.intel.com>, <airlied@...il.com>,
        <daniel@...ll.ch>, <ville.syrjala@...ux.intel.com>,
        <lucas.demarchi@...el.com>, <joonas.lahtinen@...ux.intel.com>
CC:     <rodrigo.vivi@...el.com>, <tvrtko.ursulin@...ux.intel.com>,
        <intel-gfx@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <xiafukun@...wei.com>
Subject: [PATCH] drm/i915/bios: fix a memory leak in generate_lfp_data_ptrs

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@...wei.com>
---
 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 28bdb936cd1f..edbdb949b6ce 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;
 	}
 
-- 
2.17.1