mtd: lpddr2_nvm: Fix possible null-ptr-deref

[ Upstream commit 6bdd45d795adf9e73b38ced5e7f750cd199499ff ]

It will cause null-ptr-deref when resource_size(add_range) invoked,
if platform_get_resource() returns NULL.

Fixes: 96ba9dd65788 ("mtd: lpddr: add driver for LPDDR2-NVM PCM memories")
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20221114090240.244172-1-tanghui20@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/mtd/lpddr/lpddr2_nvm.c b/drivers/mtd/lpddr/lpddr2_nvm.c
index 367e2d9..e71af4c 100644 (file)
--- a/drivers/mtd/lpddr/lpddr2_nvm.c
+++ b/drivers/mtd/lpddr/lpddr2_nvm.c
@@ -433,6 +433,8 @@ static int lpddr2_nvm_probe(struct platform_device *pdev)
 
        /* lpddr2_nvm address range */
        add_range = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!add_range)
+               return -ENODEV;
 
        /* Populate map_info data structure */
        *map = (struct map_info) {