From f5c61277f67f03df334c4486397ecff54968971b Mon Sep 17 00:00:00 2001 From: Arvind Yadav Date: Mon, 16 Jan 2017 12:14:52 +0530 Subject: [PATCH] EDAC, i82975x: Add ioremap_nocache() error handling If ioremap_nocache() fails, it will return NULL. Which will then cause a NULL-pointer dereference. Handle the returned value properly. Signed-off-by: Arvind Yadav Cc: "Arvind R." Cc: linux-edac Link: http://lkml.kernel.org/r/1484549092-11349-1-git-send-email-arvind.yadav.cs@gmail.com [ Boris: massage commit message and improve error message. ] Signed-off-by: Borislav Petkov --- drivers/edac/i82975x_edac.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/edac/i82975x_edac.c b/drivers/edac/i82975x_edac.c index 7baa8ace267b..9dcdab28f665 100644 --- a/drivers/edac/i82975x_edac.c +++ b/drivers/edac/i82975x_edac.c @@ -494,6 +494,10 @@ static int i82975x_probe1(struct pci_dev *pdev, int dev_idx) } mchbar &= 0xffffc000; /* bits 31:14 used for 16K window */ mch_window = ioremap_nocache(mchbar, 0x1000); + if (!mch_window) { + edac_dbg(3, "error ioremapping MCHBAR!\n"); + goto fail0; + } #ifdef i82975x_DEBUG_IOMEM i82975x_printk(KERN_INFO, "MCHBAR real = %0x, remapped = %p\n", -- 2.20.1