From 399154be2dcb6a58dbde9682162c38113cf3e40b Mon Sep 17 00:00:00 2001 From: Matthew Wilcox Date: Mon, 3 Dec 2007 12:10:24 -0500 Subject: [PATCH] dmapool: Validate parameters to dma_pool_create Check that 'align' is a power of two, like the API specifies. Align 'size' to 'align' correctly -- the current code has an off-by-one. The ALIGN macro in kernel.h doesn't. Signed-off-by: Matthew Wilcox Acked-by: David S. Miller --- mm/dmapool.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/mm/dmapool.c b/mm/dmapool.c index b5ff9ce..744d541 100644 --- a/mm/dmapool.c +++ b/mm/dmapool.c @@ -106,17 +106,18 @@ struct dma_pool *dma_pool_create(const char *name, struct device *dev, { struct dma_pool *retval; - if (align == 0) + if (align == 0) { align = 1; - if (size == 0) + } else if (align & (align - 1)) { return NULL; - else if (size < align) - size = align; - else if ((size % align) != 0) { - size += align + 1; - size &= ~(align - 1); } + if (size == 0) + return NULL; + + if ((size % align) != 0) + size = ALIGN(size, align); + if (allocation == 0) { if (PAGE_SIZE < size) allocation = size; -- 2.7.4