This is a note to let you know that I've just added the patch titled mtd: lpddr2_nvm: Fix possible null-ptr-deref to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mtd-lpddr2_nvm-fix-possible-null-ptr-deref.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 28474b9331c5cb2f86d553eb9c8b382f0c7e285b Author: Hui Tang <tanghui20@xxxxxxxxxx> Date: Mon Nov 14 17:02:40 2022 +0800 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@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> diff --git a/drivers/mtd/lpddr/lpddr2_nvm.c b/drivers/mtd/lpddr/lpddr2_nvm.c index 72f5c7b30079..add4386f99f0 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) {