linux-kernel - [PATCH] drm/amdgpu: Use kvfree instead of kfree in amdgpu_gmc_get_nps

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Message-Id: <20260129090542.907623-1-zilin@seu.edu.cn>
Date: Thu, 29 Jan 2026 09:05:42 +0000
From: Zilin Guan <zilin@....edu.cn>
To: alexander.deucher@....com
Cc: christian.koenig@....com,
	airlied@...il.com,
	simona@...ll.ch,
	lijo.lazar@....com,
	Hawking.Zhang@....com,
	Prike.Liang@....com,
	le.ma@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	jianhao.xu@....edu.cn,
	Zilin Guan <zilin@....edu.cn>
Subject: [PATCH] drm/amdgpu: Use kvfree instead of kfree in amdgpu_gmc_get_nps_memranges()

amdgpu_discovery_get_nps_info() internally allocates memory for ranges
using kvcalloc(), which may use vmalloc() for large allocation. Using
kfree() to release vmalloc memory will lead to a memory corruption.

Use kvfree() to safely handle both kmalloc and vmalloc allocations.

Compile tested only. Issue found using a prototype static analysis tool
and code review.

Fixes: b194d21b9bcc ("drm/amdgpu: Use NPS ranges from discovery table")
Signed-off-by: Zilin Guan <zilin@....edu.cn>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 7e623f91f2d7..cb0d1ac148e9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -1382,7 +1382,7 @@ int amdgpu_gmc_get_nps_memranges(struct amdgpu_device *adev,
 	if (!*exp_ranges)
 		*exp_ranges = range_cnt;
 err:
-	kfree(ranges);
+	kvfree(ranges);
 
 	return ret;
 }
-- 
2.34.1