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powerpc/sriov: Remove VF eeh_dev state when disabling SR-IOV 

[ Upstream commit 1fb4124ca9 ]

When disabling virtual functions on an SR-IOV adapter we currently do not
correctly remove the EEH state for the now-dead virtual functions. When
removing the pci_dn that was created for the VF when SR-IOV was enabled
we free the corresponding eeh_dev without removing it from the child device
list of the eeh_pe that contained it. This can result in crashes due to the
use-after-free.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com>
Tested-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190821062655.19735-1-oohall@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Oliver O'Halloran 2019-08-21 16:26:53 +10:00 committed by Greg Kroah-Hartman
parent 9d5fc7f14e
commit 3f6c8de753
1 changed files with 14 additions and 1 deletions
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15
arch/powerpc/kernel/pci_dn.c
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@ -244,9 +244,22 @@ void remove_dev_pci_data(struct pci_dev *pdev)
continue;
#ifdef CONFIG_EEH
/* Release EEH device for the VF */
/*
* Release EEH state for this VF. The PCI core
* has already torn down the pci_dev for this VF, but
* we're responsible to removing the eeh_dev since it
* has the same lifetime as the pci_dn that spawned it.
*/
edev = pdn_to_eeh_dev(pdn);
if (edev) {
/*
* We allocate pci_dn's for the totalvfs count,
* but only only the vfs that were activated
* have a configured PE.
*/
if (edev->pe)
eeh_rmv_from_parent_pe(edev);
pdn->edev = NULL;
kfree(edev);
}