This is a note to let you know that I've just added the patch titled
video: hyperv_fb: Fix a double free in hvfb_probe
to the 5.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
video-hyperv_fb-fix-a-double-free-in-hvfb_probe.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5be5befb43d9d73072053f94e309ef69bf2c7361
Author: Lv Yunlong <lyl2019@xxxxxxxxxxxxxxxx>
Date: Wed Mar 24 03:37:24 2021 -0700
video: hyperv_fb: Fix a double free in hvfb_probe
[ Upstream commit 37df9f3fedb6aeaff5564145e8162aab912c9284 ]
Function hvfb_probe() calls hvfb_getmem(), expecting upon return that
info->apertures is either NULL or points to memory that should be freed
by framebuffer_release(). But hvfb_getmem() is freeing the memory and
leaving the pointer non-NULL, resulting in a double free if an error
occurs or later if hvfb_remove() is called.
Fix this by removing all kfree(info->apertures) calls in hvfb_getmem().
This will allow framebuffer_release() to free the memory, which follows
the pattern of other fbdev drivers.
Fixes: 3a6fb6c4255c ("video: hyperv: hyperv_fb: Use physical memory for fb on HyperV Gen 1 VMs.")
Signed-off-by: Lv Yunlong <lyl2019@xxxxxxxxxxxxxxxx>
Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210324103724.4189-1-lyl2019@xxxxxxxxxxxxxxxx
Signed-off-by: Wei Liu <wei.liu@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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 @@ getmem_done:
} else {
pci_dev_put(pdev);
}
- kfree(info->apertures);
return 0;
@@ -1141,7 +1139,6 @@ err2:
err1:
if (!gen2vm)
pci_dev_put(pdev);
- kfree(info->apertures);
return -ENOMEM;
}
