[PATCH v2] video: hyperv_fb: Fix a double free in hvfb_probe

[Lv Yunlong]

In function hvfb_probe in hyperv_fb.c, it calls hvfb_getmem(hdev, info)
and return err when info->apertures is freed.

In the error1 label of hvfb_probe, info->apertures will be freed for the
second time in framebuffer_release(info).

My patch removes all kfree(info->apertures) instead of set info->apertures
to NULL. It is because that let framebuffer_release() handle freeing the
memory flows the fbdev pattern, and less code overall.

Signed-off-by: Lv Yunlong <lyl2...@mail.ustc.edu.cn>
---
 drivers/video/fbdev/hyperv_fb.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index c8b0ae676809..4dc9077dd2ac 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -1031,7 +1031,6 @@ static int hvfb_getmem(struct hv_device *hdev, struct 
fb_info *info)
                        PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
                if (!pdev) {
                        pr_err("Unable to find PCI Hyper-V video\n");
-                       kfree(info->apertures);
                        return -ENODEV;
                }
 
@@ -1129,7 +1128,6 @@ static int hvfb_getmem(struct hv_device *hdev, struct 
fb_info *info)
        } else {
                pci_dev_put(pdev);
        }
-       kfree(info->apertures);
 
        return 0;
 
@@ -1141,7 +1139,6 @@ static int hvfb_getmem(struct hv_device *hdev, struct 
fb_info *info)
 err1:
        if (!gen2vm)
                pci_dev_put(pdev);
-       kfree(info->apertures);
 
        return -ENOMEM;
 }
-- 
2.25.1