xgene_allocate_domains() will call irq_domain_remove() to free
msi->inner_domain on failure. However, its caller, xgene_msi_probe(),
will also call irq_domain_remove() through xgene_msi_remove() on the
same failure, which may lead to a use-after-free. Remove the first
irq_domain_remove() and let xgene_free_domains() cleanup domains.

Fixes: dcd19de36775 ("PCI: xgene: Add APM X-Gene v1 PCIe MSI/MSIX termination driver")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---

Changelog:

v2: -Remove irq_domain_remove() instead of nulling msi_domain.
---
 drivers/pci/controller/pci-xgene-msi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pci-xgene-msi.c b/drivers/pci/controller/pci-xgene-msi.c
index 3ce38dfd0d29..0f9b9394399d 100644
--- a/drivers/pci/controller/pci-xgene-msi.c
+++ b/drivers/pci/controller/pci-xgene-msi.c
@@ -251,10 +251,8 @@ static int xgene_allocate_domains(struct xgene_msi *msi)
 						    &xgene_msi_domain_info,
 						    msi->inner_domain);
 
-	if (!msi->msi_domain) {
-		irq_domain_remove(msi->inner_domain);
+	if (!msi->msi_domain)
 		return -ENOMEM;
-	}
 
 	return 0;
 }
-- 
2.17.1

On Tue, 26 Sep 2023 03:59:36 +0100,
Dinghao Liu <dinghao.liu@zju.edu.cn> wrote:
> 
> xgene_allocate_domains() will call irq_domain_remove() to free
> msi->inner_domain on failure. However, its caller, xgene_msi_probe(),
> will also call irq_domain_remove() through xgene_msi_remove() on the
> same failure, which may lead to a use-after-free. Remove the first
> irq_domain_remove() and let xgene_free_domains() cleanup domains.
> 
> Fixes: dcd19de36775 ("PCI: xgene: Add APM X-Gene v1 PCIe MSI/MSIX termination driver")
> Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
> ---
> 
> Changelog:
> 
> v2: -Remove irq_domain_remove() instead of nulling msi_domain.

Unfortunately, your email doesn't indicate this is v2.

	M.

-- 
Without deviation from the norm, progress is not possible.

> On Tue, 26 Sep 2023 03:59:36 +0100,
> Dinghao Liu <dinghao.liu@zju.edu.cn> wrote:
> > 
> > xgene_allocate_domains() will call irq_domain_remove() to free
> > msi->inner_domain on failure. However, its caller, xgene_msi_probe(),
> > will also call irq_domain_remove() through xgene_msi_remove() on the
> > same failure, which may lead to a use-after-free. Remove the first
> > irq_domain_remove() and let xgene_free_domains() cleanup domains.
> > 
> > Fixes: dcd19de36775 ("PCI: xgene: Add APM X-Gene v1 PCIe MSI/MSIX termination driver")
> > Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
> > ---
> > 
> > Changelog:
> > 
> > v2: -Remove irq_domain_remove() instead of nulling msi_domain.
> 
> Unfortunately, your email doesn't indicate this is v2.

Sorry, my mistake. I will resend a new patch soon.

Regards,
Dinghao