linux-kernel - [PATCH AUTOSEL for 4.9 019/156] drm/amdgpu: fix parser init error path to avoid crash in parser fini

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Message-ID: <20171207154845.4814-19-alexander.levin@verizon.com>
Date:   Thu, 7 Dec 2017 15:48:58 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Dave Airlie <airlied@...hat.com>,
        Alex Deucher <alexander.deucher@....com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 019/156] drm/amdgpu: fix parser init error
 path to avoid crash in parser fini

From: Dave Airlie <airlied@...hat.com>

[ Upstream commit 607523d19c9d67ba4cf7bdaced644f11ed04992c ]

If we don't reset the chunk info in the error path, the subsequent
fini path will double free.

Reviewed-by: Christian König <christian.koenig@....com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index bfb4b91869e7..f26d1fd53bef 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -240,6 +240,8 @@ free_partial_kdata:
 	for (; i >= 0; i--)
 		drm_free_large(p->chunks[i].kdata);
 	kfree(p->chunks);
+	p->chunks = NULL;
+	p->nchunks = 0;
 put_ctx:
 	amdgpu_ctx_put(p->ctx);
 free_chunk:
-- 
2.11.0