From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	patches@lists.linux.dev,
	Lijo Lazar <lijo.lazar@amd.com>,
	Zilin Guan <zilin@seu.edu.cn>,
	Alex Deucher <alexander.deucher@amd.com>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.19 707/781] drm/amdgpu: Use kvfree instead of kfree in amdgpu_gmc_get_nps_memranges()
Date: Tue, 24 Feb 2026 17:23:36 -0800
Message-ID: <20260225012417.090844891@linuxfoundation.org>
In-Reply-To: <20260225012359.695468795@linuxfoundation.org>
References: <20260225012359.695468795@linuxfoundation.org>
User-Agent: quilt/0.69
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

6.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zilin Guan <zilin@seu.edu.cn>

[ Upstream commit 0c44d61945c4a80775292d96460aa2f22e62f86c ]

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")
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 d9c7ad297293b..2b37398337afc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -1387,7 +1387,7 @@ int amdgpu_gmc_get_nps_memranges(struct amdgpu_device *adev,
 	if (!*exp_ranges)
 		*exp_ranges = range_cnt;
 err:
-	kfree(ranges);
+	kvfree(ranges);
 
 	return ret;
 }
-- 
2.51.0