From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 12 Aug 2021 07:00:04 +0000 (+0300)
Subject: PCI: Fix pci_dev_str_match_path() alloc while atomic bug
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=f10f727cf9f452909be535a4e2db51baca7dff41;p=linux-block.git

PCI: Fix pci_dev_str_match_path() alloc while atomic bug

[ Upstream commit 7eb6ea4148579b85540a41d57bcec315b8af8ff8 ]

pci_dev_str_match_path() is often called with a spinlock held so the
allocation has to be atomic.  The call tree is:

  pci_specified_resource_alignment() <-- takes spin_lock();
    pci_dev_str_match()
      pci_dev_str_match_path()

Fixes: 45db33709ccc ("PCI: Allow specifying devices using a base bus and path of devfns")
Link: https://lore.kernel.org/r/20210812070004.GC31863@kili
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index eae6a9fdd33d..0d7109018a91 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -265,7 +265,7 @@ static int pci_dev_str_match_path(struct pci_dev *dev, const char *path,
 
 	*endptr = strchrnul(path, ';');
 
-	wpath = kmemdup_nul(path, *endptr - path, GFP_KERNEL);
+	wpath = kmemdup_nul(path, *endptr - path, GFP_ATOMIC);
 	if (!wpath)
 		return -ENOMEM;