linux-kernel - [PATCH v2 1/2] drm/amdgpu: Fix double free in amdgpu_userq_fence_driver

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Message-ID: <d4583e103f65e850f886babcf1b290b0855ba04c.1744468610.git.dan.carpenter@linaro.org>
Date: Sat, 12 Apr 2025 17:39:32 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@....com>
Cc: Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Arvind Yadav <Arvind.Yadav@....com>,
	Shashank Sharma <shashank.sharma@....com>,
	amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] drm/amdgpu: Fix double free in
 amdgpu_userq_fence_driver_alloc()

The goto frees "fence_drv" so this is a double free bug.  There is no
need to call amdgpu_seq64_free(adev, fence_drv->va) since the seq64
allocation failed so change the goto to goto free_fence_drv.  Also
propagate the error code from amdgpu_seq64_alloc() instead of hard coding
it to -ENOMEM.

Fixes: e7cf21fbb277 ("drm/amdgpu: Few optimization and fixes for userq fence driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
v2: No change.

 drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
index a4953d668972..b012fece91e8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
@@ -84,11 +84,8 @@ int amdgpu_userq_fence_driver_alloc(struct amdgpu_device *adev,
 	/* Acquire seq64 memory */
 	r = amdgpu_seq64_alloc(adev, &fence_drv->va, &fence_drv->gpu_addr,
 			       &fence_drv->cpu_addr);
-	if (r) {
-		kfree(fence_drv);
-		r = -ENOMEM;
-		goto free_seq64;
-	}
+	if (r)
+		goto free_fence_drv;
 
 	memset(fence_drv->cpu_addr, 0, sizeof(u64));
 
-- 
2.47.2