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Date: Mon, 16 Jan 2017 12:14:52 +0530 From: Arvind Yadav <arvind.yadav.cs@...il.com> To: ravi@...ztechnologies.com, arvino55@...il.com Cc: bp@...en8.de, mchehab@...nel.org, linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH v1] edac: i82975x_edac :- Handle return NULL error from ioremap_nocache Here, If ioremap_nocache will fail. It will return NULL. Kernel can run into a NULL-pointer dereference. This error check will avoid NULL pointer dereference. Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com> --- 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 7baa8ac..e747d82 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, "failed to memory map!\n"); + goto fail0; + } #ifdef i82975x_DEBUG_IOMEM i82975x_printk(KERN_INFO, "MCHBAR real = %0x, remapped = %p\n", -- 1.9.1
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