[PATCH 6.1 0348/1146] mtd: lpddr2_nvm: Fix possible null-ptr-deref

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From: Hui Tang <tanghui20@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Acked-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Link: https://lore.kernel.org/linux-mtd/20221114090240.244172-1-tanghui20@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/mtd/lpddr/lpddr2_nvm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mtd/lpddr/lpddr2_nvm.c b/drivers/mtd/lpddr/lpddr2_nvm.c
index 367e2d906de0..e71af4c49096 100644
--- 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) {
-- 
2.35.1






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