From f88c602fd0ab289d03e0e279ce83ddf01c24ec22 Mon Sep 17 00:00:00 2001 From: Chester Lin Date: Tue, 7 Nov 2023 22:10:44 +0800 Subject: [PATCH] pinctrl: s32cc: Avoid possible string truncation [ Upstream commit 08e8734d877a9a0fb8af1254a4ce58734fbef296 ] With "W=1" and "-Wformat-truncation" build options, the kernel test robot found a possible string truncation warning in pinctrl-s32cc.c, which uses an 8-byte char array to hold a memory region name "map%u". Since the maximum number of digits that a u32 value can present is 10, and the "map" string occupies 3 bytes with a termination '\0', which means the rest 4 bytes cannot fully present the integer "X" that exceeds 4 digits. Here we check if the number >= 10000, which is the lowest value that contains more than 4 digits. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202311030159.iyUGjNGF-lkp@intel.com/ Signed-off-by: Chester Lin Link: https://lore.kernel.org/r/20231107141044.24058-1-clin@suse.com Signed-off-by: Linus Walleij Signed-off-by: Sasha Levin --- drivers/pinctrl/nxp/pinctrl-s32cc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pinctrl/nxp/pinctrl-s32cc.c b/drivers/pinctrl/nxp/pinctrl-s32cc.c index 7daff9f..f0cad2c 100644 --- a/drivers/pinctrl/nxp/pinctrl-s32cc.c +++ b/drivers/pinctrl/nxp/pinctrl-s32cc.c @@ -843,8 +843,8 @@ static int s32_pinctrl_probe_dt(struct platform_device *pdev, if (!np) return -ENODEV; - if (mem_regions == 0) { - dev_err(&pdev->dev, "mem_regions is 0\n"); + if (mem_regions == 0 || mem_regions >= 10000) { + dev_err(&pdev->dev, "mem_regions is invalid: %u\n", mem_regions); return -EINVAL; } -- 2.7.4