4.19-stable review patch. If anyone has any objections, please let me know.
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From: "Gustavo A. R. Silva" gustavo@embeddedor.com
[ Upstream commit fbed20280d912449cfb40c382cb55e3d11502587 ]
There is a potential execution path in which function of_find_compatible_node() returns NULL. In such a case, we end up having a NULL pointer dereference when accessing pointer *nfc_np* in function of_clk_get().
So, we better don't take any chances and fix this by null checking pointer *nfc_np* before calling of_clk_get().
Addresses-Coverity-ID: 1473052 ("Dereference null return value") Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver") Signed-off-by: Gustavo A. R. Silva gustavo@embeddedor.com Reviewed-by: Boris Brezillon boris.brezillon@bootlin.com Acked-by: Tudor Ambarus tudor.ambarus@microchip.com Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mtd/nand/raw/atmel/nand-controller.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/mtd/nand/raw/atmel/nand-controller.c +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c @@ -2063,6 +2063,10 @@ atmel_hsmc_nand_controller_legacy_init(s nand_np = dev->of_node; nfc_np = of_find_compatible_node(dev->of_node, NULL, "atmel,sama5d3-nfc"); + if (!nfc_np) { + dev_err(dev, "Could not find device node for sama5d3-nfc\n"); + return -ENODEV; + }
nc->clk = of_clk_get(nfc_np, 0); if (IS_ERR(nc->clk)) {