From mboxrd@z Thu Jan 1 00:00:00 1970 From: ray.jui@broadcom.com (Ray Jui) Date: Thu, 12 Jan 2017 16:48:25 -0800 Subject: [PATCH] PCI: iproc: fix kernel crash if dev->of_node not defined In-Reply-To: <6891f43f-25e7-1411-800e-97e6788f2f27@gmail.com> References: <1484266817-6725-1-git-send-email-aospan@netup.ru> <6891f43f-25e7-1411-800e-97e6788f2f27@gmail.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Florian, On 1/12/2017 4:22 PM, Florian Fainelli wrote: > On 01/12/2017 04:20 PM, Abylay Ospan wrote: >> pcie->dev->of_node not always defined (NULL) and can cause crash: >> >> [ 19.053195] Unable to handle kernel NULL pointer dereference at >> virtual address 00000020 >> [] (of_n_addr_cells) from [] >> (iproc_pcie_setup+0x30c/0xce0) >> >> this patch adds sanity check to prevent crash. > > Humm, how can it not be defined based on your earlier comment that you > are using this on NSP which is Device Tree exclusively? I would agree if > this was seen on e.g: MIPS/BCMA (47xx). I thought Abylay mentioned: "Tested on Broadcom NorthStar machine ('Edgecore ECW7220-L') with two PCIe wifi adapters (b43 BCM4331 and ath10k QCA988X)." That is a NorthStar device which is BCMA based? > >> >> Signed-off-by: Abylay Ospan >> --- >> drivers/pci/host/pcie-iproc.c | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c >> index 3ebc025..f2836a9 100644 >> --- a/drivers/pci/host/pcie-iproc.c >> +++ b/drivers/pci/host/pcie-iproc.c >> @@ -952,6 +952,9 @@ static int pci_dma_range_parser_init(struct of_pci_range_parser *parser, >> const int na = 3, ns = 2; >> int rlen; >> >> + if (!node) >> + return -ENOENT; >> + >> parser->node = node; >> parser->pna = of_n_addr_cells(node); >> parser->np = parser->pna + na + ns; >> > >