This is a note to let you know that I've just added the patch titled
PCI/MSI: Remove over-zealous hardware size check in pci_msix_validate_entries()
to the 6.2-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:
pci-msi-remove-over-zealous-hardware-size-check-in-pci_msix_validate_entries.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e3c026be4d3ca046799fde55ccbae9d0f059fb93 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date: Mon, 10 Apr 2023 21:14:45 +0200
Subject: PCI/MSI: Remove over-zealous hardware size check in pci_msix_validate_entries()
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
commit e3c026be4d3ca046799fde55ccbae9d0f059fb93 upstream.
pci_msix_validate_entries() validates the entries array which is handed in
by the caller for a MSI-X interrupt allocation. Aside of consistency
failures it also detects a failure when the size of the MSI-X hardware table
in the device is smaller than the size of the entries array.
That's wrong for the case of range allocations where the caller provides
the minimum and the maximum number of vectors to allocate, when the
hardware size is greater or equal than the mininum, but smaller than the
maximum.
Remove the hardware size check completely from that function and just
ensure that the entires array up to the maximum size is consistent.
The limitation and range checking versus the hardware size happens
independently of that afterwards anyway because the entries array is
optional.
Fixes: 4644d22eb673 ("PCI/MSI: Validate MSI-X contiguous restriction early")
Reported-by: David Laight <David.Laight@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/87v8i3sg62.ffs@tglx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pci/msi/msi.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index 1f716624ca56..ef1d8857a51b 100644
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -750,8 +750,7 @@ static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries,
return ret;
}
-static bool pci_msix_validate_entries(struct pci_dev *dev, struct msix_entry *entries,
- int nvec, int hwsize)
+static bool pci_msix_validate_entries(struct pci_dev *dev, struct msix_entry *entries, int nvec)
{
bool nogap;
int i, j;
@@ -762,10 +761,6 @@ static bool pci_msix_validate_entries(struct pci_dev *dev, struct msix_entry *en
nogap = pci_msi_domain_supports(dev, MSI_FLAG_MSIX_CONTIGUOUS, DENY_LEGACY);
for (i = 0; i < nvec; i++) {
- /* Entry within hardware limit? */
- if (entries[i].entry >= hwsize)
- return false;
-
/* Check for duplicate entries */
for (j = i + 1; j < nvec; j++) {
if (entries[i].entry == entries[j].entry)
@@ -805,7 +800,7 @@ int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int
if (hwsize < 0)
return hwsize;
- if (!pci_msix_validate_entries(dev, entries, nvec, hwsize))
+ if (!pci_msix_validate_entries(dev, entries, nvec))
return -EINVAL;
if (hwsize < nvec) {
--
2.40.0
Patches currently in stable-queue which might be from tglx@xxxxxxxxxxxxx are
queue-6.2/pci-msi-remove-over-zealous-hardware-size-check-in-pci_msix_validate_entries.patch
