From: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
To: kys@microsoft.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, wei.liu@kernel.org
Cc: linux-hyperv@vger.kernel.org,
Lv Yunlong <lyl2019@mail.ustc.edu.cn>,
linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] video/fbdev: Fix a double free in hvfb_probe
Date: Tue, 23 Mar 2021 00:33:50 -0700 [thread overview]
Message-ID: <20210323073350.17697-1-lyl2019@mail.ustc.edu.cn> (raw)
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 twice
by framebuffer_release(info).
My patch sets info->apertures to NULL after it was freed to avoid
double free.
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
---
drivers/video/fbdev/hyperv_fb.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index c8b0ae676809..2fc9b507e73a 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -1032,6 +1032,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
if (!pdev) {
pr_err("Unable to find PCI Hyper-V video\n");
kfree(info->apertures);
+ info->apertures = NULL;
return -ENODEV;
}
@@ -1130,6 +1131,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
pci_dev_put(pdev);
}
kfree(info->apertures);
+ info->apertures = NULL;
return 0;
@@ -1142,6 +1144,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
if (!gen2vm)
pci_dev_put(pdev);
kfree(info->apertures);
+ info->apertures = NULL;
return -ENOMEM;
}
--
2.25.1
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next reply other threads:[~2021-03-23 7:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-23 7:33 Lv Yunlong [this message]
2021-03-23 11:28 ` [PATCH] video/fbdev: Fix a double free in hvfb_probe Wei Liu
2021-03-23 18:52 ` Michael Kelley
2021-03-24 10:24 ` lyl2019
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