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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 <arvind.yadav.cs@gmail.com>
Cc: "Arvind R." <arvino55@gmail.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
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 <bp@suse.de>
This commit is contained in:
Arvind Yadav 2017-01-16 12:14:52 +05:30 committed by Borislav Petkov
parent eca90a3b32
commit f5c61277f6
1 changed files with 4 additions and 0 deletions
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4
drivers/edac/i82975x_edac.c
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@ -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",