From c7e3548cac4a8a8bc1ad183cc7c7249463dff55f Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Mon, 1 Aug 2022 13:20:12 +0300 Subject: cxl/region: prevent underflow in ways_to_cxl() The "ways" variable comes from the user. The ways_to_cxl() function has an upper bound but it doesn't check for negatives. Make the "ways" variable an unsigned int to fix this bug. Fixes: 80d10a6cee05 ("cxl/region: Add interleave geometry attributes") Signed-off-by: Dan Carpenter Link: https://lore.kernel.org/r/Yueo3NV2hFCXx1iV@kili [djbw: fixup interleave_ways_store() to only accept unsigned input] Signed-off-by: Dan Williams --- drivers/cxl/core/region.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'drivers/cxl/core') diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index c80932bca667..516ba7e2de81 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -319,10 +319,11 @@ static ssize_t interleave_ways_store(struct device *dev, struct cxl_decoder *cxld = &cxlrd->cxlsd.cxld; struct cxl_region *cxlr = to_cxl_region(dev); struct cxl_region_params *p = &cxlr->params; - int rc, val, save; + unsigned int val, save; + int rc; u8 iw; - rc = kstrtoint(buf, 0, &val); + rc = kstrtouint(buf, 0, &val); if (rc) return rc; -- cgit v1.2.3