linux-kernel - [PATCH 4.19 035/114] PCI: rpaphp: Fix up pointer to first drc-info entry

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Date:   Thu,  2 Jan 2020 23:06:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tyrel Datwyler <tyreld@...ux.ibm.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 035/114] PCI: rpaphp: Fix up pointer to first drc-info entry

From: Tyrel Datwyler <tyreld@...ux.ibm.com>

[ Upstream commit 9723c25f99aff0451cfe6392e1b9fdd99d0bf9f0 ]

The first entry of the ibm,drc-info property is an int encoded count
of the number of drc-info entries that follow. The "value" pointer
returned by of_prop_next_u32() is still pointing at the this value
when we call of_read_drc_info_cell(), but the helper function
expects that value to be pointing at the first element of an entry.

Fix up by incrementing the "value" pointer to point at the first
element of the first drc-info entry prior.

Signed-off-by: Tyrel Datwyler <tyreld@...ux.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/1573449697-5448-5-git-send-email-tyreld@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/hotplug/rpaphp_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c
index cc860c5f7d26..f56004243591 100644
--- a/drivers/pci/hotplug/rpaphp_core.c
+++ b/drivers/pci/hotplug/rpaphp_core.c
@@ -239,6 +239,8 @@ static int rpaphp_check_drc_props_v2(struct device_node *dn, char *drc_name,
 	value = of_prop_next_u32(info, NULL, &entries);
 	if (!value)
 		return -EINVAL;
+	else
+		value++;
 
 	for (j = 0; j < entries; j++) {
 		of_read_drc_info_cell(&info, &value, &drc);
-- 
2.20.1