linux-kernel - [PATCH v2] drm/amdgpu: prevent BO_HANDLES error from being overwritten

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Message-ID: <20241009122831.109809-1-pvmohammedanees2003@gmail.com>
Date: Wed,  9 Oct 2024 17:58:31 +0530
From: Mohammed Anees <pvmohammedanees2003@...il.com>
To: alexander.deucher@....com,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	simona@...ll.ch,
	srinivasan.shanmugam@....com,
	David.Wu3@....com,
	felix.kuehling@....com,
	YuanShang.Mao@....com,
	pierre-eric.pelloux-prayer@....com
Cc: amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Mohammed Anees <pvmohammedanees2003@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH v2] drm/amdgpu: prevent BO_HANDLES error from being overwritten

Before this patch, if multiple BO_HANDLES chunks were submitted,
the error -EINVAL would be correctly set but could be overwritten
by the return value from amdgpu_cs_p1_bo_handles(). This patch
ensures that if there are multiple BO_HANDLES, we stop.

Cc: stable@...r.kernel.org
Fixes: fec5f8e8c6bc ("drm/amdgpu: disallow multiple BO_HANDLES chunks in one submit")
Signed-off-by: Mohammed Anees <pvmohammedanees2003@...il.com>
---
v2:
- Switched to goto free_partial_kdata for error handling, following the existing pattern.
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 1e475eb01417..d891ab779ca7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -265,7 +265,7 @@ static int amdgpu_cs_pass1(struct amdgpu_cs_parser *p,
 
 			/* Only a single BO list is allowed to simplify handling. */
 			if (p->bo_list)
-				ret = -EINVAL;
+				goto free_partial_kdata;
 
 			ret = amdgpu_cs_p1_bo_handles(p, p->chunks[i].kdata);
 			if (ret)
-- 
2.46.0