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From:   Yi Wang <wang.yi59@zte.com.cn>
To:     zhenyuw@linux.intel.com
Cc:     zhi.a.wang@intel.com, jani.nikula@linux.intel.com,
        joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com,
        airlied@linux.ie, intel-gvt-dev@lists.freedesktop.org,
        intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, jiang.biao2@zte.com.cn,
        wang.yi59@zte.com.cn, zhong.weidong@zte.com.cn
Subject: [PATCH] drm/i915/gvt: fix memory leak in intel_vgpu_ioctl()
Date:   Fri, 3 Aug 2018 08:41:19 +0800
Message-Id: <1533256879-10220-1-git-send-email-wang.yi59@zte.com.cn>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The 'sparse' variable may leak when return in function
intel_vgpu_ioctl(), and this patch fixes this.

Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
Reviewed-by: Jiang Biao <jiang.biao2@zte.com.cn>
---
 drivers/gpu/drm/i915/gvt/kvmgt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index df4e4a0..6a6f199 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1200,6 +1200,7 @@ static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
 					return ret;
 				break;
 			default:
+				kfree(sparse);
 				return -EINVAL;
 			}
 		}
@@ -1215,6 +1216,7 @@ static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
 						  sizeof(info), caps.buf,
 						  caps.size)) {
 					kfree(caps.buf);
+					kfree(sparse);
 					return -EFAULT;
 				}
 				info.cap_offset = sizeof(info);
@@ -1223,6 +1225,7 @@ static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
 			kfree(caps.buf);
 		}
 
+		kfree(sparse);
 		return copy_to_user((void __user *)arg, &info, minsz) ?
 			-EFAULT : 0;
 	} else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
-- 
1.8.3.1