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| author | Oliver O'Halloran <oohall@gmail.com> | 2019-08-21 09:26:53 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-28 18:36:06 +0300 |
| commit | 77f804437a9cdfe4e782e31539f6cb411cf2188c (patch) | |
| tree | 780710b0aed133d8159fba90a49e7492eeef4a02 | |
| parent | e0e88677fabe4e514e2ed27815ec3141120a4afa (diff) | |
| download | linux-77f804437a9cdfe4e782e31539f6cb411cf2188c.tar.xz | |
powerpc/sriov: Remove VF eeh_dev state when disabling SR-IOV
[ Upstream commit 1fb4124ca9d456656a324f1ee29b7bf942f59ac8 ]
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>
| -rw-r--r-- | arch/powerpc/kernel/pci_dn.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c index 0e395afbf0f4..0e45a446a8c7 100644 --- a/arch/powerpc/kernel/pci_dn.c +++ b/arch/powerpc/kernel/pci_dn.c @@ -261,9 +261,22 @@ 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); } |