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PCI: rcar: Fix a potential NULL pointer dereference

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In case __get_free_pages() fails and returns NULL, fix the return
value to -ENOMEM and release resources to avoid dereferencing a
NULL pointer.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Ulrich Hecht <uli+renesas@fpond.eu>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Kangjie Lu 2019-03-15 02:29:43 -05:00 committed by Lorenzo Pieralisi
parent 954b4b752a
commit f0d14edd2b
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/controller/pcie-rcar.c
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@ -929,6 +929,10 @@ static int rcar_pcie_enable_msi(struct rcar_pcie *pcie)
/* setup MSI data target */
msi->pages = __get_free_pages(GFP_KERNEL, 0);
if (!msi->pages) {
err = -ENOMEM;
goto err;
}
base = virt_to_phys((void *)msi->pages);
rcar_pci_write_reg(pcie, lower_32_bits(base) | MSIFE, PCIEMSIALR);