From: Gustavo A. R. Silva Date: Tue, 18 Sep 2018 13:55:55 +0000 (-0500) Subject: mtd: rawnand: atmel: Fix potential NULL pointer dereference X-Git-Tag: rel_imx_5.10.35_2.0.0-somdevices.0~6145^2^2~10 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=fbed20280d912449cfb40c382cb55e3d11502587;p=linux.git mtd: rawnand: atmel: Fix potential NULL pointer dereference 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 Reviewed-by: Boris Brezillon Acked-by: Tudor Ambarus Signed-off-by: Miquel Raynal --- diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c index ad0245c66892..fb33f6be7c4f 100644 --- a/drivers/mtd/nand/raw/atmel/nand-controller.c +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c @@ -2034,6 +2034,10 @@ atmel_hsmc_nand_controller_legacy_init(struct atmel_hsmc_nand_controller *nc) 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)) {