linux-kernel - [PATCH V2] drm/amdgpu: check return value of xa

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Message-ID: <aIrQC78VWg17Iqhf@pc>
Date: Thu, 31 Jul 2025 03:08:11 +0100
From: Salah Triki <salah.triki@...il.com>
To: Markus Elfring <Markus.Elfring@....de>,
	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: salah.triki@...il.com
Subject: [PATCH V2] drm/amdgpu: check return value of xa_store()

The `xa_store()` function can fail due to memory allocation issues or other
internal errors. Currently, the return value of `xa_store()` is not
checked, which can lead to a memory leak if it fails to store `numa_info`.

This patch checks the return value of `xa_store()`. If an error is
detected, the allocated `numa_info` is freed, and NULL is returned to
indicate the failure, preventing a memory leak and ensuring proper error
handling.

Signed-off-by: Salah Triki <salah.triki@...il.com>
Fixes: 1cc823011a23f ("drm/amdgpu: Store additional numa node information")
Cc: Alex Deucher <alexander.deucher@....com>
Cc: Christian König <christian.koenig@....com>
Cc: David Airlie <airlied@...il.com>
Cc: Simona Vetter <simona@...ll.ch>
Cc: amd-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org
Cc: stable@...r.kernel.org
---
Changes in v2:
    - Improve description
    - Add tags Fixes and Cc

 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index f5466c592d94..b4a3e4d3e957 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -876,7 +876,7 @@ static inline uint64_t amdgpu_acpi_get_numa_size(int nid)
 
 static struct amdgpu_numa_info *amdgpu_acpi_get_numa_info(uint32_t pxm)
 {
-	struct amdgpu_numa_info *numa_info;
+	struct amdgpu_numa_info *numa_info, *old;
 	int nid;
 
 	numa_info = xa_load(&numa_info_xa, pxm);
@@ -898,7 +898,11 @@ static struct amdgpu_numa_info *amdgpu_acpi_get_numa_info(uint32_t pxm)
 		} else {
 			numa_info->size = amdgpu_acpi_get_numa_size(nid);
 		}
-		xa_store(&numa_info_xa, numa_info->pxm, numa_info, GFP_KERNEL);
+		old = xa_store(&numa_info_xa, numa_info->pxm, numa_info, GFP_KERNEL);
+		if (xa_is_err(old)) {
+			kfree(numa_info);
+			return NULL;
+		}
 	}
 
 	return numa_info;
-- 
2.43.0