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
[<c0b0370c>] (of_n_addr_cells) from [<c06599c4>]
(iproc_pcie_setup+0x30c/0xce0)
this patch adds sanity check to prevent crash.
Signed-off-by: Abylay Ospan <aos...@netup.ru>
---
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;
--
2.7.4
