From mboxrd@z Thu Jan 1 00:00:00 1970 From: iamjoonsoo.kim@lge.com (Joonsoo Kim) Date: Thu, 12 Jun 2014 12:21:39 +0900 Subject: [PATCH v2 02/10] DMA, CMA: fix possible memory leak In-Reply-To: <1402543307-29800-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1402543307-29800-1-git-send-email-iamjoonsoo.kim@lge.com> Message-ID: <1402543307-29800-3-git-send-email-iamjoonsoo.kim@lge.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org We should free memory for bitmap when we find zone mis-match, otherwise this memory will leak. Additionally, I copy code comment from ppc kvm's cma code to notify why we need to check zone mis-match. Signed-off-by: Joonsoo Kim diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c index bd0bb81..fb0cdce 100644 --- a/drivers/base/dma-contiguous.c +++ b/drivers/base/dma-contiguous.c @@ -177,14 +177,24 @@ static int __init cma_activate_area(struct cma *cma) base_pfn = pfn; for (j = pageblock_nr_pages; j; --j, pfn++) { WARN_ON_ONCE(!pfn_valid(pfn)); + /* + * alloc_contig_range requires the pfn range + * specified to be in the same zone. Make this + * simple by forcing the entire CMA resv range + * to be in the same zone. + */ if (page_zone(pfn_to_page(pfn)) != zone) - return -EINVAL; + goto err; } init_cma_reserved_pageblock(pfn_to_page(base_pfn)); } while (--i); mutex_init(&cma->lock); return 0; + +err: + kfree(cma->bitmap); + return -EINVAL; } static struct cma cma_areas[MAX_CMA_AREAS]; -- 1.7.9.5