From fd54349ddb61445a8a42459b3dc09237c55e6f78 Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Wed, 15 Mar 2023 14:31:28 +0300 Subject: [PATCH] genwqe: fix MAX_ORDER usage MAX_ORDER is not inclusive: the maximum allocation order buddy allocator can deliver is MAX_ORDER-1. Fix MAX_ORDER usage in genwqe driver. Link: https://lkml.kernel.org/r/20230315113133.11326-6-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov Cc: Frank Haverkamp Signed-off-by: Andrew Morton --- drivers/misc/genwqe/card_dev.c | 2 +- drivers/misc/genwqe/card_utils.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/misc/genwqe/card_dev.c b/drivers/misc/genwqe/card_dev.c index 55fc5b80e649..d0e27438a73c 100644 --- a/drivers/misc/genwqe/card_dev.c +++ b/drivers/misc/genwqe/card_dev.c @@ -443,7 +443,7 @@ static int genwqe_mmap(struct file *filp, struct vm_area_struct *vma) if (vsize == 0) return -EINVAL; - if (get_order(vsize) > MAX_ORDER) + if (get_order(vsize) >= MAX_ORDER) return -ENOMEM; dma_map = kzalloc(sizeof(struct dma_mapping), GFP_KERNEL); diff --git a/drivers/misc/genwqe/card_utils.c b/drivers/misc/genwqe/card_utils.c index f778e11237a6..ac29698d085a 100644 --- a/drivers/misc/genwqe/card_utils.c +++ b/drivers/misc/genwqe/card_utils.c @@ -308,7 +308,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, sgl->write = write; sgl->sgl_size = genwqe_sgl_size(sgl->nr_pages); - if (get_order(sgl->sgl_size) > MAX_ORDER) { + if (get_order(sgl->sgl_size) >= MAX_ORDER) { dev_err(&pci_dev->dev, "[%s] err: too much memory requested!\n", __func__); return ret;